CN105806204A - Installing method of shaft displacement measurement system - Google Patents
Installing method of shaft displacement measurement system Download PDFInfo
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- CN105806204A CN105806204A CN201610317371.1A CN201610317371A CN105806204A CN 105806204 A CN105806204 A CN 105806204A CN 201610317371 A CN201610317371 A CN 201610317371A CN 105806204 A CN105806204 A CN 105806204A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
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Abstract
The invention provides an installing method of a shaft displacement measurement system.The shaft displacement measurement system comprises a shaft displacement probe.The installing method includes the steps that a shaft is pushed in the first axial direction so that a push rod, between a first thrust bearing and a second thrust bearing, on the shaft can make contact with the first thrust bearing, and real-time sensing voltage sensed by the shaft displacement probe correlated with the shaft is obtained and serves as first voltage; the shaft is pushed in the second axial direction so that the push rod can make contact with the second thrust bearing, and real-time sensing voltage sensed by the shaft displacement probe is obtained and serves as second voltage; the first voltage and the second voltage are averaged, and the average value serves as the standard zero level of the shaft displacement probe; the actual zero level of the shaft displacement probe is adjusted through the standard zero level.By adopting the installing method, it is ensured that the mechanical zero and the electric zero of the shaft displacement measurement system are consistent in phase, the measurement precision of the shaft displacement measurement system is improved, and the installing efficiency of the shaft displacement probe is improved.
Description
Technical field
The present invention relates to the technical field of petrochemical industry, measure the installation method of system in particular to a kind of axial displacement.
Background technology
The axial displacement of the Large-scale machine set of the industries such as oil refining, petrochemical industry, Coal Chemical Industry, coal liquifaction is one of most important running state parameter of unit.Axial displacement refer to unit inner rotator along axis direction relative to the gap between both thrust bearings, axial displacement is the most important parameters directly reflecting Large-scale machine set dynamic and static gaps, and the safeguard protection of unit is even more important by measuring of rotor axial displacement.
In prior art, typically require installation axial displacement measurement system axial displacement is monitored, axial displacement conventional in prior art measures system as shown in Figure 1, it is sequentially connected with the shaft displacement probe 20 ' of setting, metal joint 30 ', extension cable 40 ', preamplifier 50 ' including along the target surface 110 ' direction of measuring away from axle 10 ', connects cable 60 ' and detection module 70 ', and for fixing support 80 ' and the probe locking nut 90 ' of this shaft displacement probe.Axial displacement is measured the installation method of system and is included machinery clearance measurement Method for Installation and electric clearance measurement Method for Installation, wherein, electric clearance measurement Method for Installation also includes the thrust bearing of axle being shifted onto the method installed at mechanical zero place and thrust bearing being pushed into work surface or the method for non-working surface installation, but above-mentioned installation method is all carry out installing when zero potential locks, and each installation method all also exists inevitable shortcoming, the measurement of unit axial displacement there is impact in various degree.
In machinery clearance measurement Method for Installation, owing to utilizing the gap detected between target surface of clearance gauge measurement axis displacement probe and axle largely to rely on the sensation of people, thus inevitably causing measurement error, and then the measurement error of axial displacement can be caused.And although the method that thrust bearing is shifted onto in electric clearance measurement Method for Installation the installation of mechanical zero place can overcome the problems referred to above, but it is the same with machinery clearance measurement Method for Installation, all there is the problem that the difficulty that axle is shifted onto in practical operation mechanical zero is very big, thus causing needing the repeated multiple times phenomenon that thrust bearing could be pushed into relatively accurate mechanical zero；And when shifting thrust bearing onto mechanical zero, angle of inclination is inevitably resulted between detection target surface and axis, owing to the depth of parallelism between axial displacement measuring probe and detection target surface cannot be ensured, dispersing of shaft displacement probe electromagnetic induction line will be made to change axial displacement and measure the electrical characteristic curve of system, cause axial displacement to measure inaccurate；And when actual installation shaft displacement probe, owing to machinery clearance measurement Method for Installation needs repeatedly with clearance gauge measurement axis displacement probe and the gap detecting target surface, thus needing shaft displacement probe constantly precession or back-out, and thrust bearing is shifted onto the method installed at mechanical zero place and needs to measure the output of the preamplifier matched with shaft displacement probe, thus all causing when final lock shaft displacement probe, the problem that shaft displacement probe and the gap detecting target surface are easy to change, the problems referred to above can further result in the measurement error of axial displacement, it is possible to obtain comparatively satisfied measurement effect thus needing repeatedly to adjust, and then cause installation method loaded down with trivial details and installation accuracy is low.
The method of work surface or non-working surface installation that is pushed into by axle in electric clearance measurement Method for Installation is compared with first two installation method, although there is shaft displacement probe and installing easily, the advantage detecting the inclination angle between target surface and axis will not be produced, but need constantly to measure the output of the preamplifier matched with shaft displacement probe when shaft displacement probe is installed, when the output of preamplifier reaches to install current potential, stop precession or the back-out of shaft displacement probe, probe locking nut is utilized to lock, often when lock shaft displacement probe, the output voltage of preamplifier has deflected away from installation current potential, can only again unclamp locking nut, readjust the gap between shaft displacement probe and detection target surface, so need the repeated multiple times installation that just can complete shaft displacement probe；And in actual mechanical process, distance rod holds and has one layer of oil film between thrust bearing, so according to calculated installation current potential, shaft displacement probe is installed and the zero potential that system is measured in axial displacement can be made to deviate, inevitably result in axial displacement measurement error.
The setup error of system is measured owing to the installation method of above-mentioned axial displacement measurement system there will be axial displacement in actual applications often; thus causing that the axle system mechanical zero of unit is inconsistent with the electric zero point that system is measured in axial displacement; axial displacement is caused to measure system after unit operation starts; axial displacement measurement error is bigger; directly affect the security interlocking protection of unit, bring very big potential safety hazard to the safe operation of unit.
Summary of the invention
Present invention is primarily targeted at the installation method providing a kind of axial displacement to measure system, the installation method to solve prior art axis displacement measurement system causes that the problem that certainty of measurement is poor and installation effectiveness is relatively low of system is measured in axial displacement.
To achieve these goals, according to an aspect of the present invention, provide a kind of axial displacement and measure the installation method of system, axial displacement is measured system and is included shaft displacement probe, installation method includes: along the axial first direction impeller-hub of axle, make the distance rod between the first thrust bearing and the second thrust bearing on axle contact the first thrust bearing, and obtain that the shaft displacement probe being associated with axle senses sense voltage in real time as the first voltage；Along the axial second direction impeller-hub of axle, making distance rod contact the second thrust bearing, the voltage of sensing in real time that acquisition shaft displacement probe senses is as the second voltage；First voltage and the second voltage are averaged, and using the meansigma methods benchmark zero potential as shaft displacement probe；The actual zero potential of shaft displacement probe is adjusted by benchmark zero potential.
Further, when axial displacement measurement system includes multiple shaft displacement probe, in the step of first direction impeller-hub vertically, the first voltage of each shaft displacement probe is obtained；In the step of second direction impeller-hub vertically, obtain the second voltage of each shaft displacement probe.
Further, before the step of first direction impeller-hub vertically and second direction impeller-hub vertically, installation method also includes: step S1, measurement axis detection target surface and shaft displacement probe between distance, and draw the electrical characteristic curve sensing in real time change in voltage that distance senses with shaft displacement probe.
Further, in step sl, the distance between detection target surface and shaft displacement probe is 10～100mils, and the voltage of sensing in real time that shaft displacement probe senses is-1～-19Vdc, and the mid-point voltage of electrical characteristic curve is-10VDC.
Further, after step S1, installation method also includes: step S2, the distance adjusted between detection target surface and shaft displacement probe, makes the voltage of sensing in real time that shaft displacement probe senses be equal to the mid-point voltage of electrical characteristic curve.
Further, in step s 2, the step adjusting the distance between detection target surface and shaft displacement probe includes: distance rod is pushed into mechanical zero place, and by mounting bracket precession or back-out shaft displacement probe, so that the voltage of sensing in real time that shaft displacement probe senses is equal to the mid-point voltage of electrical characteristic curve.
Further, using meansigma methods as after the step of the benchmark zero potential of shaft displacement probe, installation method also includes: confirm whether benchmark zero potential is measured within the scope of the zero potential that scope is corresponding with axial displacement in electrical characteristic curve, when zero potential is not within the scope of zero potential, perform step S2.
Further, axial displacement is measured system and is also included the preamplifier that is connected with shaft displacement probe, is used for obtaining that the shaft displacement probe being associated with axle senses senses voltage in real time.
Further, what utilize circuit tester measurement preamplifier acquisition senses voltage in real time.
Further, in the step being adjusted actual zero potential by benchmark zero potential, the numerical value of benchmark zero potential is inputted in configuration software, utilize configuration software to adjust the actual zero potential of shaft displacement probe.
nullApplication technical scheme，The invention provides a kind of axial displacement and measure the installation method of system，Owing to above-mentioned installation method is that the distance rod of axle contacts the first thrust bearing and the second thrust bearing respectively，Sense voltage in real time by what obtain that the shaft displacement probe that is associated with axle senses and calculate its meansigma methods and adjust the actual zero potential of described shaft displacement probe，Thus not only eliminating the impact detecting target surface and axis generation inclination angle and countershaft displacement measurement because of axle，And owing to the oil film of work surface place thrust bearing is cancelled out each other with the impact of the countershaft displacement measurement system of oil film of non-working surface place thrust bearing，Eliminate the impact of the zero potential of the countershaft displacement measurement system of oil film of thrust bearing，The mechanical zero being effectively guaranteed axial displacement measurement system is consistent with the electric zero potential that system is measured in axial displacement，And then improve the certainty of measurement of axial displacement measurement system and improve shaft displacement probe installation effectiveness.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The Figure of description constituting the part of the present invention is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 illustrates that the position view of system and axle is measured in axial displacement of the prior art；
Fig. 2 illustrates that the position view of system and axle is measured in the axial displacement that embodiment of the present invention provides；And
Fig. 3 illustrates that the electrical characteristic curve of system is measured in the axial displacement that embodiment of the present invention provides.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a present invention part, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, all should belong to the scope of protection of the invention.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, without being used for describing specific order or precedence.Should be appreciated that the data of so use can be exchanged in the appropriate case, in order to embodiments of the invention described herein.In addition, term " includes " and " having " and their any deformation, it is intended to cover non-exclusive comprising, such as, contain series of steps or the process of unit, method, system, product or equipment be not necessarily limited to those steps or the unit clearly listed, but can include clearly not listing or for intrinsic other step of these processes, method, product or equipment or unit.
As what background technology was introduced; the installation method of existing axial displacement measurement system often there will be axial displacement in actual applications and measures the setup error of system; thus causing that the axle system mechanical zero of unit is inconsistent with the electric zero point that system is measured in axial displacement; axial displacement is caused to measure system after unit operation starts; axial displacement measurement error is bigger; directly affect the security interlocking protection of unit, bring very big potential safety hazard to the safe operation of unit.The present inventor studies for the problems referred to above, propose a kind of axial displacement and measure the installation method of system, axial displacement is measured system and is included shaft displacement probe, installation method includes: first direction impeller-hub vertically, make the distance rod between the first thrust bearing and the second thrust bearing on axle contact the first thrust bearing, and obtain that the shaft displacement probe being associated with axle senses sense voltage in real time as the first voltage；Second direction impeller-hub vertically, makes distance rod contact the second thrust bearing, and the voltage of sensing in real time that acquisition shaft displacement probe senses is as the second voltage；First voltage and the second voltage are averaged, and using the meansigma methods benchmark zero potential as shaft displacement probe；The actual zero potential of shaft displacement probe is adjusted by benchmark zero potential.
Owing to above-mentioned installation method being the distance rod of axle is contacted respectively the first thrust bearing and the second thrust bearing, sense voltage in real time by what obtain that the shaft displacement probe that is associated with axle senses and calculate its meansigma methods and adjust the actual zero potential of shaft displacement probe, thus not only eliminating the impact detecting target surface and axis generation inclination angle and countershaft displacement measurement because of axle, and owing to the oil film of work surface place thrust bearing is cancelled out each other with the impact of the countershaft displacement measurement system of oil film of non-working surface place thrust bearing, eliminate the impact of the zero potential of the countershaft displacement measurement system of oil film of thrust bearing, the mechanical zero being effectively guaranteed axial displacement measurement system is consistent with the electric zero potential that system is measured in axial displacement, and then improve the certainty of measurement of axial displacement measurement system and improve shaft displacement probe installation effectiveness.
And, owing to above-mentioned installation method not being the zero potential of lock shaft displacement measurement system, need not install shaft displacement probe time constantly measurement axis displacement probe sense sense voltage in real time, without when sensing voltage reaches to install current potential in real time, utilize probe locking nut by lock shaft displacement probe, thus avoiding the voltage of sensing in real time caused when being locked by shaft displacement probe and the deviation installing current potential, and then ensure that the mechanical zero of axle system is consistent with the electric zero potential that system is measured in axial displacement, namely when axle is in mechanical zero, axial displacement is measured the output one of system and is decided to be electric zero potential, finally improve axial displacement and measure the certainty of measurement of system.
Above-mentioned axial displacement is measured metal joint 30, extension cable 40, preamplifier 50 that system can also include being sequentially connected with shaft displacement probe 20, is connected cable 60 and detection module 70, and for fixing support 80 and the probe locking nut 90 of this shaft displacement probe 20, above-mentioned preamplifier 50 senses voltage in real time for what obtain that the shaft displacement probe 20 being associated with axle 10 senses；Axle 10 is provided with distance rod 140 and is arranged at the first thrust bearing 120 and the second thrust bearing 130 of these distance rod 140 both sides, the end measuring the adjacent axle 10 of system with axial displacement is also associated with measuring target surface, and the position relationship of system and axle 10 is measured in above-mentioned axial displacement can be as shown in Figure 2.
The illustrative embodiments of the installation method provided according to the application is provided below in conjunction with Fig. 2.But, these illustrative embodiments can be implemented by multiple different form, and should not be construed to be limited solely to embodiments set forth herein.It should be appreciated that these embodiments are provided so that disclosure herein is thorough and complete, and the design of these illustrative embodiments is fully conveyed to those of ordinary skill in the art.
First, along axle 10 to first direction impeller-hub 10, make the distance rod 140 between the first thrust bearing 120 and the second thrust bearing 130 on axle 10 contact the first thrust bearing 120, and obtain that the shaft displacement probe 20 being associated with axle 10 senses sense voltage in real time as the first voltage；Further, along axle 10 to second direction impeller-hub 10, making distance rod 140 contact the second thrust bearing 130, the voltage of sensing in real time that acquisition shaft displacement probe 20 senses is as the second voltage.Wherein, it is thus achieved that the sequencing of above-mentioned first voltage and above-mentioned second voltage is not absolute, those skilled in the art can determine to obtain the sequencing of the first voltage and the second voltage according to practical situation.
The accuracy that system is installed is measured, it is preferable that axial displacement is measured system and included at least two shaft displacement probe 20 in order to improve axial displacement further.When axial displacement measurement system includes multiple shaft displacement probe 20, along axle 10 to the step of first direction impeller-hub 10, obtain the first voltage of each shaft displacement probe 20；Along axle 10 to the step of second direction impeller-hub 10, obtain the second voltage of each shaft displacement probe 20.
In a preferred embodiment, along axle 10 to first direction impeller-hub 10 with along axle 10 to before the step of second direction impeller-hub 10, installation method also includes: step S1, measurement axis 10 detection target surface 110 and shaft displacement probe 20 between distance, and draw the electrical characteristic curve sensing in real time change in voltage that distance senses with shaft displacement probe 20.System is measured for the 3300XL series 8mm shaft displacement probe 20 of Bentley, 4m extension cable 40,3300XL series 5m preamplifier 50 and the axial displacement of Bently 3500/42M axial displacement detection module 70 composition that is connected with preamplifier 50, utilize the electrical characteristic curve that above-mentioned axial displacement measurement system obtains as shown in Figure 3, abscissa be axle 10 measure target surface to the distance between shaft displacement probe 20, vertical coordinate is the output voltage of preamplifier 50.
As can be seen from Figure 3: the range of linearity of 3300XL series 8mm shaft displacement probe 20 is 2.3mm (90mils) (100mils=2.54mm), the range of linearity starts to 2.5mm (100mils) from being about 0.25mm (10mils) from tested target surface, the output of the preamplifier 50 matched with it is about (-1Vdc～-19Vdc), now the mid-point voltage of electrical characteristic curve is-10VDC, and namely the sensitivity of preamplifier 50 is 7.87V/mm (200mV/mil).
For above-mentioned electrical characteristic curve, Bentley corporate policy: the range of linearity of 3300XL series 8mm shaft displacement probe 20 is 2mm (80mils), the range of linearity starts to 2.3mm (90mils) from being about 0.25mm (10mils) from tested target surface, the scope of the range of linearity ratio regulation that the electrical characteristic curve of system is measured in axial displacement is big as can be seen here, this also means that the zero potential of axial displacement measurement system not necessarily must be locked in axial displacement and measure the characteristic mid-point voltage of system, as long as meeting when axle 10 is in mechanical zero (i.e. the half of the axle amount of altering), axial displacement is measured the preamplifier 50 of system and is output as electric zero potential (namely show value is 0).Further, axial displacement measure system electric zero potential be have a range of, measure scope more little, zero potential scope is more big；Measurement scope is more big, and zero potential scope is more little.Electrical characteristic curve according to Fig. 3, when measurement ranges for ± 25mil, zero-point voltage ranges for-6.33～-13.99VDC；When measurement ranges for ± 30mil, zero-point voltage ranges for-7.33～-12.99VDC；When measurement ranges for ± 40mil, zero-point voltage ranges for-9.33～-10.99VDC；When measurement ranges for ± 0.5mm, zero-point voltage ranges for-5.27～-15.05VDC；When measurement ranges for ± 1.0mm, zero-point voltage ranges for-9.20～-11.12VDC.
After step S1, installation method includes: step S2, the distance adjusted between detection target surface 110 and shaft displacement probe 20, makes the voltage of sensing in real time that shaft displacement probe 20 senses be equal to the mid-point voltage of electrical characteristic curve.In step s 2, the step adjusting the distance between detection target surface 110 and shaft displacement probe 20 includes: distance rod 140 is pushed into mechanical zero place, and by mounting bracket 80 precession or back-out shaft displacement probe 20, so that the voltage of sensing in real time that shaft displacement probe 20 senses is equal to the mid-point voltage of electrical characteristic curve.Sense the voltage mid-point voltage equal to electrical characteristic curve in real time when what shaft displacement probe 20 sensed, utilize respective locking nut 90 to be locked by shaft displacement probe 20, to be fixed by shaft displacement probe 20.
When shifting distance rod 140 onto mechanical zero, measure and can inevitably result from angle of inclination between target surface and axis, and owing to axial displacement measuring probe and the depth of parallelism measured between target surface cannot be ensured, axial displacement will be changed because of dispersing of shaft displacement probe 20 electromagnetic induction line and measure the electrical characteristic curve of system, cause axial displacement to measure inaccurate.Therefore, in above-mentioned steps S2, it is possible to use amesdial is measured, and shifts onto near mechanical zero by distance rod 140, it is not necessary to very accurate, accurate mechanical zero namely need not repeatedly be found.Owing to need not repeatedly, accurately find mechanical zero, thus greatly reducing the workload of installation.
Complete to obtain above-mentioned first voltage and obtain above-mentioned second voltage step after, the first voltage and the second voltage are averaged, and using the meansigma methods benchmark zero potential as shaft displacement probe 20.The first voltage obtained during by distance rod 140 is contacted the first thrust bearing 120 is averaged with the second voltage obtained when distance rod 140 is contacted the second thrust bearing 130, so that on the first thrust bearing 120 work surface oil film and on the second thrust bearing 130 impact of the countershaft displacement measurement system of oil film of non-working surface cancel out each other, and then eliminate the impact of the electric zero potential of countershaft displacement measurement system of the oil film between distance rod 140 and thrust bearing, improve axial displacement and measure the precision of system.
In a preferred embodiment, using meansigma methods as after the step of the benchmark zero potential of shaft displacement probe 20, installation method also includes: confirm whether benchmark zero potential is measured within the scope of the zero potential that scope is corresponding with axial displacement in electrical characteristic curve, when zero potential is not within the scope of zero potential, again adjust the distance between detection target surface 110 and shaft displacement probe 20, the voltage of sensing in real time that shaft displacement probe 20 senses is made to be equal to the mid-point voltage (namely again performing step S2) of electrical characteristic curve, by above-mentioned preferred embodiment, can be further ensured that the accuracy that system is installed is measured in axial displacement.
First voltage and the second voltage are averaged completing, and using meansigma methods as after the step of the benchmark zero potential of shaft displacement probe 20, being adjusted the actual zero potential of shaft displacement probe 20 by benchmark zero potential.The first voltage owing to obtaining when being that distance rod 140 is contacted the first thrust bearing 120 is averaged with the second voltage obtained when distance rod 140 is contacted the second thrust bearing 130, again using this meansigma methods actual zero potential as shaft displacement probe 20, so that on the first thrust bearing 120 work surface oil film and on the second thrust bearing 130 impact of the countershaft displacement measurement system of oil film of non-working surface cancel out each other, and then eliminate the impact of the electric zero potential of countershaft displacement measurement system of the oil film between distance rod 140 and thrust bearing, improve axial displacement and measure the precision of system.
In the step being adjusted actual zero potential by benchmark zero potential, it is possible to inputted in configuration software by the numerical value of benchmark zero potential, configuration software is utilized to adjust the actual zero potential of shaft displacement probe 20.Above-mentioned configuration software can be 3500 system configuration softwares (RackConfigurationSoftware), utilize 3500 system configuration softwares (RackConfigurationSoftware), it is possible to the zero potential of the passage of the 3500/42M module (detection module 70) being connected with each shaft displacement probe 20 is adjusted to benchmark zero potential.
The installation method of system is measured in the axial displacement that further illustrating the application below in conjunction with embodiment provides.
Adopt the 3300XL series 8mm shaft displacement probe of Bentley, 4m extension cable, 3300XL series 5m preamplifier and look into the axial displacement measurement system of the Bently 3500/42M axial displacement detection module composition being connected with preamplifier, the axle amount of altering is a=0.4mm, axial displacement measurement ranges for ± 1.0mm, measures target surface in same axial displacement and is provided with two shaft displacement probes (instrument item respectively Z101, Z102).Owing to axial displacement measurement ranges for ± 1.0mm, then the electric zero potential of defined ranges for-9.20～-11.12VDC.
Installation method comprises the following steps:
1, utilize amesdial to measure, distance rod is shifted onto near half (i.e. 0.2mm) place of mechanical zero and the axle amount of altering, it is not necessary to very accurate；
2, by mounting bracket precession or two shaft displacement probes of back-out, High Precision Multimeter is utilized to measure the output that the preamplifier of system is measured in corresponding axial displacement, when preamplifier is output as the 3300XL8mm5m axial displacement measurement i.e.-10VDC of the characteristic mid-point voltage of system electrical, stop precession or the back-out of shaft displacement probe, utilize respective locking nut to be locked by shaft displacement probe；
3, distance rod being pushed into the work surface on the first thrust bearing, until pushing away motionless, utilizing High Precision Multimeter to measure output respectively V1=-8.48VDC, V2=-8.72VDC that corresponding axial displacement detects the preamplifier of system；
4, distance rod is pushed into the non-working surface on the second thrust bearing again, until pushing away motionless, utilizes High Precision Multimeter to measure output respectively V1 '=-11.63VDC, V2 '=-11.87VDC that corresponding axial displacement detects the preamplifier of system；
5, the zero potential of respective shaft displacement probe is calculated:
The zero potential of first shaft displacement probe is V01=1/2 (V1+V1 ')=(-8.48-11.63)/2=-10.06VDC,
The zero potential of second shaft displacement probe is V02=1/2 (V2+V2 ')=(-8.72-11.87)/2=-10.29VDC；
6, zero potential V01=-10.06VDC and the V02=-10.29VDC calculated all measuring in corresponding zero potential-9.20～-11.12VDC scope of scope ± 1.0mm with axial displacement, meets regulation requirement；
7,3500 system configuration softwares are utilized, the zero potential of the Z101 passage of the 3500/42M module being connected with shaft displacement probe is adjusted-10.06VDC, the zero potential of Z102 passage adjusts-10.29VDC, thus completing axial displacement to measure the installation process of system.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
1, the oil film of work surface thrust shoe is cancelled out each other with the impact of the countershaft displacement measurement system of oil film of non-working surface thrust shoe, thus eliminating the need the impact of the electric zero potential of countershaft displacement measurement system of the oil film between axle thrust watt and thrust shoe, improve axial displacement and measure the precision of system；
2, ensure that the mechanical zero of axle system is consistent with the electric zero potential that system is measured in axial displacement, namely when axle is in mechanical zero, stating the voltage of sensing in real time that shaft displacement probe senses must be electric zero potential, measures the certainty of measurement of system thus improve axial displacement and improves shaft displacement probe installation effectiveness；
3, eliminate because axle measures the impact of target surface and the countershaft displacement measurement in axis generation inclination angle；
4, need not repeatedly, accurately find mechanical zero, also there is no concern that the output of the preamplifier that system is measured in axial displacement changes when utilizing locking nut lock shaft displacement probe, thus greatly reduces installation workload simultaneously.
Above-mentioned axial displacement is measured the installation method of system and is not only simple easy, and effectively overcomes the shortcoming that the installation method of system is measured in existing axial displacement, thus meeting the requirement that unit axial displacement is measured.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the installation method of an axial displacement measurement system, it is characterised in that described axial displacement is measured system and included shaft displacement probe (20), and described installation method includes:
Axial first direction along axle (10) promotes described axle (10), make the distance rod (140) being positioned between the first thrust bearing (120) and the second thrust bearing (130) on described axle (10) contact described first thrust bearing (120), and obtain that the described shaft displacement probe (20) being associated with described axle (10) senses sense voltage in real time as the first voltage；
Axial second direction along described axle (10) promotes described axle (10), make described distance rod (140) contact described second thrust bearing (130), obtain the voltage of sensing in real time that described shaft displacement probe (20) senses as the second voltage；
Described first voltage and described second voltage are averaged, and using the described meansigma methods benchmark zero potential as described shaft displacement probe (20)；
The actual zero potential of described shaft displacement probe (20) is adjusted by described benchmark zero potential.
2. installation method according to claim 1, it is characterised in that when described axial displacement measurement system includes multiple described shaft displacement probe (20),
In the step promoting described axle (10) along described axle (10) to first direction, obtain described first voltage of each described shaft displacement probe (20)；
In the step promoting described axle (10) along described axle (10) to second direction, obtain described second voltage of each described shaft displacement probe (20).
3. installation method according to claim 1 and 2, it is characterized in that, along described axle (10) to first direction promote described axle (10) and along described axle (10) to second direction promote described axle (10) step before, described installation method also includes:
Distance between step S1, the detection target surface measuring described axle (10) and described shaft displacement probe (20), and draw the electrical characteristic curve sensing change in voltage in real time that described distance senses with described shaft displacement probe (20).
4. installation method according to claim 3, it is characterized in that, in described step S1, distance between described detection target surface and described shaft displacement probe (20) is 10～100mils, the voltage of sensing in real time that described shaft displacement probe (20) senses is-1～-19Vdc, and the mid-point voltage of described electrical characteristic curve is-10VDC.
5. installation method according to claim 3, it is characterised in that after described step S1, described installation method also includes:
Step S2, the distance adjusted between described detection target surface and described shaft displacement probe (20), make the voltage of sensing in real time that described shaft displacement probe (20) senses be equal to the mid-point voltage of described electrical characteristic curve.
6. installation method according to claim 5, it is characterised in that in described step S2, the step adjusting the distance between described detection target surface and described shaft displacement probe (20) includes:
Described distance rod (140) is pushed into mechanical zero place, and pass through mounting bracket precession or screw out described shaft displacement probe (20), so that the voltage of sensing in real time that described shaft displacement probe (20) senses is equal to the described mid-point voltage of described electrical characteristic curve.
7. installation method according to claim 5, it is characterised in that using described meansigma methods as after the step of the described benchmark zero potential of described shaft displacement probe (20), described installation method also includes:
Confirm whether described benchmark zero potential is measured within the scope of the zero potential that scope is corresponding with axial displacement in described electrical characteristic curve, when described zero potential is not within the scope of described zero potential, perform step S2.
8. installation method according to claim 1, it is characterized in that, described axial displacement is measured system and is also included the preamplifier (50) that is connected with described shaft displacement probe (20), senses voltage in real time for what obtain that the described shaft displacement probe (20) being associated with described axle (10) senses.
9. installation method according to claim 8, it is characterised in that utilize circuit tester to measure the described real-time sensing voltage that described preamplifier (50) obtains.
10. installation method according to claim 1 and 2, it is characterized in that, in the step being adjusted described actual zero potential by described benchmark zero potential, the numerical value of described benchmark zero potential is inputted in configuration software, utilizes described configuration software to adjust the actual zero potential of described shaft displacement probe (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610317371.1A CN105806204B (en) | 2016-05-12 | 2016-05-12 | The installation method of axle position shift measurement system |
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| CN112284738A (en) * | 2020-09-10 | 2021-01-29 | 福建福清核电有限公司 | Axial displacement measurement and zero point calibration method for nuclear power steam turbine unit |
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