CN109668672A - Ultrasonic bolt pre-tightens force measuring method - Google Patents
Ultrasonic bolt pre-tightens force measuring method Download PDFInfo
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- CN109668672A CN109668672A CN201910017182.6A CN201910017182A CN109668672A CN 109668672 A CN109668672 A CN 109668672A CN 201910017182 A CN201910017182 A CN 201910017182A CN 109668672 A CN109668672 A CN 109668672A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 239000010410 layer Substances 0.000 claims description 35
- 238000004458 analytical method Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 10
- 239000011241 protective layer Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 4
- 230000036316 preload Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims 7
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 7
- 230000000644 propagated effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002789 length control Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- 238000010361 transduction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- G01L5/246—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed using acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of ultrasonic bolts to pre-tighten force measuring method, it include: when bolt fastens for the first time, pass through the sound time difference under ultrasonic measurement bolt free state and tightening state, the elongation of bolt is calculated based on the sound time difference, bolt pretightening is obtained according to the elongation, accurately to be controlled bolt pretightening.The present invention can the precise measurement pretightning force of bolt and residual pre-tightening forces of in-service bolt when fastening for the first time, achieve the purpose that accurately to control bolt pretightening.
Description
Technical field
The invention belongs to technical field of wind power more particularly to a kind of ultrasonic bolt to pre-tighten force measuring method.
Background technique
Be bolted be wind power generating set assembly in important assembly method, be almost related to the institute of wind power generating set
There is component.Therefore, the selection of bolt and strength check and assembling quality are the important guarantees of wind power generating set reliability.
Pylon is important one of the load bearing component of wind power generating set, and tower flanges connection system is connection cabin bottom
Seat and each section of pylon important component, therefore connect reliability and safety to the normal operation of entire Wind turbines have to
Close important role.
Bump joint is a kind of dismountable device, its needs often disassembly in Practical Project, so conjunction plane sealing
Reliability just becomes the most important condition that industrial production can be made to operate normally.Bolt flange connection belongs to forced seal, by connection
Part forces extruding sealing element to be allowed to seal by connected compcnent.After bolt is tightened, bolt power passes through flange face compress gasket, pad
Piece is compacted, and is filled the gap on seal face, for the air-proof condition for preventing dielectric leakage from having reached initial.Thread connection
Pretightning force produces the critical load of full payload, connection to bolt, the ability of resistance transverse load and joint surface sealability etc.
It is raw to influence.Excessive pretightning force will lead to thread connection part static(al) destroy, connected compcnent sliding, separation or fastener pine
It is de-.Too small pretightning force will lead to bolt fatigue rupture, increase equipment quality and cost.So the size of pretightning force, accuracy
It is all particularly significant, to make major issue one of of the control of pretightning force as thread connection.
Summary of the invention
The object of the present invention is to provide a kind of ultrasonic bolts to pre-tighten force measuring method, spiral shell when fastening for the first time by precise measurement
The residual pre-tightening forces of the pretightning force of bolt and in-service bolt achieve the purpose that accurately to control bolt pretightening.
The present invention provides a kind of ultrasonic bolts to pre-tighten force measuring method, comprising:
When bolt fastens for the first time, by the sound time difference under ultrasonic measurement bolt free state and tightening state, it is based on
The sound time difference calculates the elongation of bolt, bolt pretightening is obtained according to elongation, accurately to be controlled bolt pretightening.
Further, when bolt fastens for the first time, by one lamination electroceramics of bolt head bonding or in vacuum environment
Bolt top surface is deposited on by ionic steam down and forms a composite layer sensor, piezo-electricity sensing type bolt is made, just by integral type
It takes ultrasonic bolt pretightening force measuring apparatus and piezo-electricity sensing type bolt cooperates, real-time measurement bolt pretightening.
Further, composite layer sensor is followed successively by metal electrode layer, protective layer and piezoelectric layer from top to bottom.
Further, integrated portable ultrasonic bolt pretightening force measuring apparatus include sequentially connected ultrasonic transmitter,
Ultrasonic signal acquisition device, analysis processing device.
Further, when bolt fastens for the first time, by by piezoelectric type sleeve and ultrasonic bolt pretightening force measuring apparatus group
At portable ultraphonic tools for bolts ' pretension force measuring device, real-time measurement is carried out to the pretightning force of bolt.
Further, piezoelectric type sleeve includes the sleeve part for matching with the nut screwed on bolt, and is set to
Piezoelectric sensing portion inside sleeve part for connecting with bolt head, piezoelectric sensing portion includes sequentially connected plug-type electricity
Magnet, connecting plate, silica gel damping layer, piezoceramics layer and ultrasonic coupling piece, ultrasonic coupling piece are used in push-pull electromagnet
It is connected under thrust with bolt head, push-pull electromagnet is filled by slip ring and cabling and the measurement of ultrasonic bolt pretightning force
Set connection.
Further, the contact surface of sleeve part bottom opening and nut top surface is equipped with gasket seal.
Further, the torque being additionally provided at the top of sleeve part for cooperating with torque type fastening tool tightens interface.
Further, ultrasonic bolt pretightening force measuring apparatus includes sequentially connected ultrasonic transmitter, ultrasonic signal
Acquisition device, analysis processing device.
Further, this method further include: be directed to in-service bolt, based on ultrasonic shear waves, longitudinal wave propagated in bolt when
Between linear relationship with axial stress in bolt, bolt residual pre-tightening forces are obtained, to determine the need for answering in-service bolt
It twists.
It, being capable of precise measurement bolt when fastening for the first time according to the above aspect of the present invention, pre-tighten force measuring method by ultrasonic bolt
The residual pre-tightening forces of pretightning force and in-service bolt achieve the purpose that accurately to control bolt pretightening.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is the schematic diagram that bolt of the present invention is elongated in rundown process.
Fig. 2 is the propagation time of ultrasonic signal of the present invention and the relational graph of bolt pretightening；
Fig. 3 is the structural schematic diagram of piezo-electricity sensing type bolt of the present invention；
Fig. 4 is the structural schematic diagram of piezoelectric type sleeve of the present invention；
Fig. 5 is the structural schematic diagram of bolt of the present invention real time monitoring and diagnostic system.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Present embodiments provide a kind of ultrasonic bolt preload force measuring method, comprising:
When bolt fastens for the first time, by the sound time difference under ultrasonic measurement bolt free state and tightening state, it is based on
The sound time difference calculates the elongation of bolt, bolt pretightening is obtained according to elongation, accurately to be controlled bolt pretightening.
Pre-tighten force measuring method by the ultrasonic bolt, can precise measurement when fastening for the first time the pretightning force of bolt and
The residual pre-tightening forces for using as a servant bolt, have achieved the purpose that accurate control bolt pretightening.
Join shown in Fig. 3, when bolt fastens for the first time, by one lamination electroceramics of bolt head (bolt matrix 34) bonding
Or bolt top surface is deposited on by ionic steam under vacuum conditions and forms a composite layer sensor, piezo-electricity sensing type spiral shell is made
Bolt, with integrated portable ultrasonic bolt pretightening force measuring apparatus and piezo-electricity sensing type bolt, real-time measurement bolt pretightening.
In the present embodiment, composite layer sensor is followed successively by metal electrode layer 31, protective layer 32 and piezoelectric layer from top to bottom
33。
In the present embodiment, integrated portable ultrasonic bolt pretightening force measuring apparatus includes sequentially connected ultrasonic wave transmitting
Device, ultrasonic signal acquisition device, analysis processing device.
In the present embodiment, when bolt fastens for the first time, by the way that piezoelectric type sleeve and the measurement of ultrasonic bolt pretightning force are filled
Composition portable ultraphonic tools for bolts ' pretension force measuring device is set, real-time measurement is carried out to the pretightning force of bolt.
To join shown in Fig. 4, piezoelectric type sleeve includes the sleeve part 3 for matching with the nut 2 screwed on bolt 1, and
Piezoelectric sensing portion inside sleeve part 3 for connecting with 1 head of bolt, piezoelectric sensing portion includes sequentially connected pushes away
Pull-type electromagnet 4, connecting plate 5, silica gel damping layer 6, piezoceramics layer 7 and ultrasonic coupling piece 8, ultrasonic coupling piece 8 is for pushing away
It is connected under the thrust of pull-type electromagnet 4 with 1 head of bolt, push-pull electromagnet 4 passes through slip ring and cabling 9 and ultrasound
The connection of tools for bolts ' pretension force measuring device.
In the present embodiment, 3 bottom opening of sleeve part and the contact surface of 2 top surface of nut are equipped with gasket seal 11.
In the present embodiment, the torque being additionally provided at the top of sleeve part 3 for cooperating with torque type fastening tool tightens interface
12。
In the present embodiment, ultrasonic bolt pretightening force measuring apparatus includes sequentially connected ultrasonic transmitter, ultrasonic wave
Signal pickup assembly, analysis processing device.
In the present embodiment, this method further include: be directed to in-service bolt, propagated in bolt based on ultrasonic shear waves, longitudinal wave
Time and axial stress in bolt linear relationship, obtain bolt residual pre-tightening forces, with determine the need for in-service bolt into
Row is multiple to twist.
Invention is further described in detail below.
(1) pretightning force measures when bolt fastens for the first time
Guarantee that screw element connection can overcome various either statically or dynamically external force suffered by connected compcnent, to screw element connection
Tightening requirement is that screw element generates certain pretightning force to part.Realize that the tightening control method of pretightning force has very much,
Manual method, calibrated wrench method, torque axis horn cupping, yield limit control methods and the bolt pre-stretched method that such as spanner is tightened.
Wherein, the characteristics of controlling the method for pretightning force by screw-down torque is that control target is intuitive, and measurement is easy, and is operated
Journey is easy, and control program is simple；The disadvantage is that being tightened due to the influence that will receive friction factor and geometric parameter deviation in certain
Under torque, the discreteness for pre-tightening force value is bigger.Therefore, not high come the control precision that controls pretightning force by screw-down torque, accidentally
It is poor generally to can reach 40% or so.
Measurement bolt stretches after being in rundown process or tighten by the method that bolt elongate amount controls pretightning force
Length controls bolt pretightening using the relationship of pretightning force and bolt length variable quantity.The advantages of this method is stretching for bolt
It is long only related with the stress of bolt, without the influence for considering the variable factors such as friction factor, juxtaposition metamorphose, connected compcnent deformation.
The disadvantage is that the elongation of measurement bolt is very inconvenient.
The present embodiment passes through the sound time difference calculating elongation under ultrasonic measurement bolt free state and tightening state, thus
It obtains bolt pretightening, very high control precision, the field high especially suitable for seal requests such as flange systems of connections can be obtained
It closes.
As shown in Figures 1 and 2, bolt is elongated in rundown process, and Δ L is elongation, when the sound of ultrasonic signal
Poor Δ t and bolt pretightening are directly proportional.
When tightening nut, bolt generates stretcher strain under the action of pretightning force.Before bolt surrender, bolt is being stretched
Generate flexible deformation when deformation, the relationship of elongation and pretightning force is linear relationship.Its calculation formula is:
F=ES Δ L/L；
In formula, F is bolt pretightening, and E is the elasticity modulus of bolt material；S is bolt sectional area；Δ L is bolt elongate
Amount；L is the clamping length of bolt pair.
When precise measurement, the linear relationship between the bolt sound time difference and bolt pretightening is demarcated first, when by measurement sound
Difference can accurately calculate bolt pretightening, and then the pretightning force of bolt is adjusted to range appropriate, and what guarantee flange coupled can
By property and compactness.
Join Fig. 3 shown in, in one embodiment, bolt head (bolt matrix 34) bonding one lamination electroceramics or by from
Sub- vapor deposition forms a composite layer sensor in bolt top surface, is made piezo-electricity sensing type bolt under vacuum conditions, and first
Layer is metal electrode layer 31, and the second layer is protective layer 32, and third layer is piezoelectric layer 33.By by ultrasonic transmitter, ultrasonic wave
The integrated portable ultrasonic bolt pretightening force measuring apparatus and piezo-electricity sensing type that signal pickup assembly and analysis processing device are constituted
Bolt cooperation can real―time precision measurment bolt pretightening at the scene.
When ultrasonic transmitter touches this piezoelectric ceramics or composite layer sensor (metal electrode layer), high-voltage electricity is generated
Pulse, electric pulse are added to piezoelectric layer (piezoelectric ceramics), its is made to generate ultrasonic wave, and ultrasonic wave propagates in bolt, return signal by
After ultrasonic signal acquisition device receives, handled through analysis processing device analysis, it will be when the pretightning force measured value of front bolt is aobvious
Show that unit is shown.The high-acruracy survey and control of stress pre-tighten power may be implemented by this method, guarantee whole equipment or structure
The reliability and safety of work, and the cost for handling bolt is far below the cost that device upgrade is regenerated.In addition, being steamed using ion
Vapour deposition method forms sensing element (composite layer sensor) in bolt surface, also can avoid super to cooperate by smearing affinity agent
When sound measurement by coupling layer uniformity, workpiece surface roughness, working face and the verticality of bolt axis, both ends of the surface it is parallel
Degree, operator the uncertain factors such as experience interference, cause ultrasonic measurement exist in actual operation numerical discretization degree it is big,
The big defect of uncertainty of measurement.
Join shown in Fig. 4, in another embodiment, passes through piezoelectric type sleeve and above-mentioned ultrasonic bolt pretightening force measuring apparatus group
At portable ultrasonic tools for bolts ' pretension force measuring device, bolt pretightening is measured.
The piezoelectric type sleeve includes sleeve part 3 for cooperating with 1 top nut 2 of bolt and is used for inside sleeve part 3
The piezoelectric sensing portion connected with 1 head of bolt, piezoelectric sensing portion includes sequentially connected push-pull electromagnet 4, connecting plate
5, silica gel damping layer 6, piezoceramics layer 7, ultrasonic coupling piece 8, ultrasonic coupling piece 8 are used to make in the thrust of push-pull electromagnet 4
It is connected with lower with 2 head of bolt, push-pull electromagnet 4 passes through slip ring and cabling 9 and ultrasonic bolt pretightening force measuring apparatus
Connection.The opening of sleeve part 3 and the contact surface of 2 top surface of nut are equipped with gasket seal 11.
Ultrasonic coupling piece 8 can also be substituted with protective layer, at this point, injecting access 10 by the couplant that sleeve part 3 is arranged
Couplant is injected between protective layer and bolt head.It is additionally provided with torque at the top of sleeve part 3 and tightens interface 12, any power can be connected
Square type fastening tool.
The ultrasonic bolt pretightening force measuring apparatus, by piezoceramics layer emit ultrasonic measurement bolt fastening when bolt
Length change (elongation), to obtain the exact numerical of bolt pretightening, when realizing that bolt fastens for the first time, bolt pretightening
Accurate control, and be integrated with the high efficiency of torque spanner and the accuracy of hydraulic stretching device.
(2) in-service bolt residual pre-tightening forces measurement
Using under stress conditions, ultrasonic longitudinal wave, shear wave have the characteristics that not play the factor in unison, and ultrasonic shear waves are in bolt
In time for being propagated in bolt of time for propagating and ultrasonic longitudinal wave and axial stress in bolt (axle power) it is linear, to
The bolt of installation can directly measure bolt residual pre-tightening forces in the case where not dismantling.
The time and axial stress in bolt that the time and ultrasonic longitudinal wave that ultrasonic shear waves are propagated in bolt propagate in bolt
Linear relationship it is as follows:
In formula, TTFor the shear wave echo time under stress state；TLFor the longitudinal wave echo time under stress state；TT0It is unstressed
The shear wave echo time under state；TL0For the longitudinal wave echo time under unstress state；K is sound bullet constant；L is bolt clamping length；F
For bolt residual pre-tightening forces.
In order to guarantee the compactness of connection, with prevent from coupling it is loaded after generate gap between joint surface, F >=0 should be made.Recommendation is adopted
F are as follows: for the connection for thering is compactness to require, F=(1.5-1.8) F；For general connection, when service load is stablized, F
=(0.6-1.8) F；When service load is unstable, F=(0.6-1.0) F.
By accurately measuring in-service bolt residual pre-tightening forces, it can determine whether in-service bolt needs to twist again, to guarantee to join
The compactness connect.
Join shown in Fig. 5, a kind of bolt real time monitoring and the ultrasonic transduction that diagnostic system includes for connecting with bolt head
Device, signal acquisition module, temperature detecting module, interface modular converter and analysis processing device, analysis and processing module include calculating
Module, diagnostic module and display module.
Bolt head is bonded with a lamination electroceramics or is deposited on bolt top surface shape by ionic steam under vacuum conditions
At a composite layer sensor (structure shown in Fig. 3 can be used), piezo-electricity sensing type bolt is made.Ultrasonic transducer (probe) and spiral shell
Bolt head contact generates high electric field pulse, and electric pulse is added to piezoelectric layer (piezoelectric ceramics), it is made to generate ultrasonic wave, ultrasonic wave (packet
Include shear wave and longitudinal wave) it is propagated in bolt, after return signal is received by signal acquisition module, after interface modular converter is converted,
It is handled into analysis processing device analysis, bolt is monitored in real time and is diagnosed, the residual pre-tightening forces of bolt is obtained, judges spiral shell
The tightening state of bolt, and given warning in advance and life prediction, pass through display module real-time display bolt monitor and diagnosis data.
In order to carry out temperature-compensating during real time monitoring, which is being equipped with the temperature inspection for detecting bolt temperature
Module is surveyed, temperature detecting module is connect with nut, and the temperature value measured is transmitted to analysis processing device by interface modular converter, is used for
Temperature-compensating.
The remote real-time monitoring to multiple blower bolts can be realized by bolt real time monitoring and diagnostic system, can such as be incited somebody to action
Ultrasonic transducer host is mounted on tower bottom, connects multiple probes by deconcentrator and detects to each bolt, ultrasound is changed
Energy device host is communicated with monitoring center, realizes long-range monitoring.Logical that unique ID is arranged in every monitored bolt, system is logical
It crosses and identifies this ID, can be realized, which need to monitor bolt to each, is managed.
The present invention has the following technical effect that
1) standardization, the fine-grained management to Wind turbines bolt, Quan Mianzhun can be realized with Intellectualized visual mode
Wind turbines bolt really is controlled in the defects of life cycle management degree of impairment and residual life situation.
2) using the bolt clamp force of axle power and the control of elongation Compound Control Technique, precision is high, control is accurate.
3) bolt real time monitoring and diagnostic system and portable ultrasonic tools for bolts ' pretension force measuring device, can be independent, can also be simultaneously
Bolt is monitored, the failure recall rate of bolt is improved, reduces bolt failure probability.
4) it realizes that multimode, multi-point data acquisition, detection and data are transmitted, realizes real time data detection, acquisition and place
Reason, instead of previous mass data transmission mode, is optimized for selectively transmitting after first handling.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781332A (en) * | 2019-01-08 | 2019-05-21 | 中国大唐集团新能源科学技术研究院有限公司 | Method based on axle power and elongation control bolt pretightening |
| CN110207884A (en) * | 2019-07-10 | 2019-09-06 | 成都大汇智联科技有限公司 | A kind of system and method for monitoring hydraulic turbine key bolt pretightening on-line |
| CN110514344A (en) * | 2019-07-18 | 2019-11-29 | 青海大学 | An accurate control method for the pre-tightening force of aero-engine bolts |
| CN110530571A (en) * | 2019-08-30 | 2019-12-03 | 航天精工股份有限公司 | The method that a kind of pair of belt sensor threaded male fastener carries out pretightning force calibration |
| CN110726499A (en) * | 2019-11-13 | 2020-01-24 | 中国工程物理研究院机械制造工艺研究所 | Universal bolt pretightening force detection ultrasonic probe and detection method thereof |
| CN110849517A (en) * | 2019-11-20 | 2020-02-28 | 哈尔滨工业大学 | Measurement method of assembly fastening force of large-scale high-speed rotary equipment based on acoustic-elastic effect |
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| CN115389087A (en) * | 2022-08-30 | 2022-11-25 | 西南交通大学 | Method for measuring bolt pretension force based on different modal echo signals |
| CN117168675A (en) * | 2023-09-19 | 2023-12-05 | 浙江大学杭州国际科创中心 | Wireless passive ultrasonic bolt pretightening force monitoring device and method |
| CN119245909A (en) * | 2024-11-14 | 2025-01-03 | 广州大学 | Bolt preload detection device and detection method |
| CN119323142A (en) * | 2024-12-18 | 2025-01-17 | 昊宇睿联(天津)科技有限公司 | Bolt spot inspection method and device based on data fusion |
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| CN112227208A (en) * | 2020-09-23 | 2021-01-15 | 中铁大桥局集团有限公司 | Monitoring and forecasting method for construction period and operation period of suspension bridge cable clamp screw |
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| CN113218560B (en) * | 2021-04-19 | 2022-05-17 | 中国长江电力股份有限公司 | Ultrasonic real-time estimation method for bolt pretightening force |
| CN113218560A (en) * | 2021-04-19 | 2021-08-06 | 中国长江电力股份有限公司 | Ultrasonic real-time estimation method for bolt pretightening force |
| CN113624388A (en) * | 2021-07-08 | 2021-11-09 | 中国科学院工程热物理研究所 | Pretightening force-nut tightening torque calibration system of gas turbine pull rod rotor |
| CN115389087A (en) * | 2022-08-30 | 2022-11-25 | 西南交通大学 | Method for measuring bolt pretension force based on different modal echo signals |
| CN117168675A (en) * | 2023-09-19 | 2023-12-05 | 浙江大学杭州国际科创中心 | Wireless passive ultrasonic bolt pretightening force monitoring device and method |
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Application publication date: 20190423 |