CN215639896U - Linkage monitoring system for monitoring loosening of bolt or nut - Google Patents
Linkage monitoring system for monitoring loosening of bolt or nut Download PDFInfo
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- CN215639896U CN215639896U CN202022599900.6U CN202022599900U CN215639896U CN 215639896 U CN215639896 U CN 215639896U CN 202022599900 U CN202022599900 U CN 202022599900U CN 215639896 U CN215639896 U CN 215639896U
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- loosening
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- 230000004044 response Effects 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 24
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- 238000005452 bending Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 16
- 238000007689 inspection Methods 0.000 abstract description 4
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The utility model discloses a linkage monitoring system for monitoring bolt or nut looseness, which comprises an optical fiber force sensing device, a monitoring device and a monitoring system, wherein the optical fiber force sensing device comprises an optical fiber and two optical fiber connecting parts; two optical fiber connecting parts are fixed on the optical fiber, and the length of the optical fiber between the two optical fiber connecting parts is set to be larger than the linear distance between the two optical fiber connecting parts; be equipped with the deformation response section on the optic fibre between two optical fiber connecting portion, the deformation response section produces deformation when optical fiber connecting portion receive external force, and two optical fiber connecting portion are fixed respectively on two bolts or nuts. The linkage monitoring system for monitoring the loosening of the bolt or the nut realizes real-time and accurate monitoring of the bolt or the nut of the wind driven generator, can find the loosening of the bolt or the nut of the wind driven generator or the breakage of the bolt in time so as to be convenient for timely maintenance, improves the scientificity and the reliability of the inspection and maintenance of the wind driven generator, and reduces the maintenance cost.
Description
The application claims priority from chinese patent application CN201911161692.7 filed on day 11, month 22 in 2019 and chinese patent application CN201911161693.1 filed on day 11, month 22 in 2019. The present application refers to the above-mentioned chinese patent application in its entirety.
Technical Field
The utility model relates to a linkage monitoring system for monitoring bolt or nut looseness.
Background
At present, the wind power generation industry is widely popularized all over the world, and due to the fact that most of the wind power generation industry is arranged on the sea or in remote mountainous areas along the sea, daily maintenance is extremely inconvenient. Moreover, the number of bolts for fixing the large wind driven generator is very large (more than 500 bolts are fixed on one large wind driven generator), and the bolts or nuts on the wind driven generator are easy to loosen due to the severe environment, so that the wind driven generator is damaged or even collapsed due to the loosening of the bolts or nuts. During the normal operation of the wind generating set, the polling period of the high-strength bolt is generally half a year to one year, the polling period interval is long, the condition that the bolt or the nut is loosened or the bolt is broken cannot be found in time, and a large amount of time, manpower and material resources are consumed for polling each time, and particularly for the offshore wind generating set, kilometers are deeply arranged in a coastline, the polling of the unit is inconvenient, the polling cost is high, and the like.
In the prior art, chinese patent publication No. CN110220682A discloses a monitoring device for monitoring bolt loosening, which uses a narrow bandwidth pulse laser as a light source, and connects a plurality of gratings in series on an optical fiber by time division multiplexing technology to realize the loosening detection of a plurality of bolts. In such a monitoring device, if the optical fiber is disconnected due to the use environment or the like, the monitoring device needs to be entirely replaced, which undoubtedly increases the labor cost and the material cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of overcoming the defect that whether a plurality of optical gratings are used for detecting the looseness of a bolt by connecting one optical fiber in series and the defect that the whole bolt needs to be replaced due to the fact that the optical fiber is disconnected in the prior art, and provides a linkage monitoring system for monitoring the looseness of the bolt or a nut.
The utility model solves the technical problems through the following technical scheme:
a linkage monitoring system for monitoring bolt or nut looseness comprises an optical fiber force sensing device, wherein the optical fiber force sensing device comprises an optical fiber and two optical fiber connecting parts;
two optical fiber connecting parts are fixed on the optical fiber, and the length of the optical fiber between the two optical fiber connecting parts is set to be larger than the linear distance between the two optical fiber connecting parts;
two be equipped with the deformation response section on the optic fibre between the optic fibre connecting portion, the deformation response section is in when optic fibre connecting portion receive external force, two optic fibre connecting portion fix respectively on two bolts or nuts.
In this scheme, the last optic fibre force sensing device of this linkage monitored control system is fixed and reserve length as deformation induction section and carry out qualitative and/or ration through two optic fibre connecting portion on optic fibre, and optic fibre is stretched the back, and deformation induction section produces after receiving certain pulling force and deforms and can make the light of the specific wavelength in the optic fibre produce reflection or diffraction for the light signal of corresponding wavelength light produces the change in the optic fibre. When the monitoring system is used for monitoring the looseness of the bolt or the nut, the bolt or the nut can be judged to be loosened only if two optical fiber force sensing devices on the same bolt or the same nut are deformed, misjudgment caused by the deformation of one optical fiber force sensing device due to external factors is avoided, the bolt or the nut of the wind driven generator can be accurately monitored in real time, the looseness of the bolt or the nut of the wind driven generator or the breakage of the bolt can be found in time, the maintenance is facilitated in time, the scientificity and the reliability of the inspection and the maintenance of the wind driven generator are improved, and the maintenance cost is reduced.
Preferably, the linkage monitoring system further comprises a fixing component, and the fixing component is used for connecting the optical fiber connecting part to the bolt or the nut.
In this embodiment, the fixing member is provided on the bolt or the nut to facilitate mounting of the optical fiber force sensing device on the bolt or the nut to be monitored.
Preferably, the fixed part is a profile modeling nut, the middle part of the profile modeling nut comprises a profile modeling installation part of a polygonal inner hole matched with the head of the bolt or the outer side of the nut, at least two clamping parts are arranged in the circumferential direction of the outer side of the profile modeling installation part, and the clamping parts are used for fixing the optical fiber connecting part.
In this scheme, make the form of profile modeling nut with fixed part, the convenient installation is on the head or the nut of bolt, and two joint portions on the profile modeling nut can the fixed optical fiber force sensing device's of convenient installation two optical fiber connecting portion.
Preferably, a joint groove has in the joint portion, the both sides of joint portion are equipped with the open slot respectively, two the open slot is located the both ends in joint groove and with the joint groove is linked together, the joint groove is used for the block to fix the optic fibre connecting portion, optic fibre passes two the open slot.
In this scheme, adopt above-mentioned structural style for the convenience of the quick joint of optic fibre connecting portion is fixed, can not influence optic fibre again simultaneously and be stretched or compress when bolt or nut rotate.
Preferably, the deformation sensing section is a fiber grating.
In the scheme, the fiber grating is used as the deformation induction section of the optical fiber, because the fiber grating has the characteristics of small volume, good wavelength selectivity, no influence of nonlinear effect, insensitive polarization, large bandwidth range, small additional loss, miniaturized device, good coupling, capability of being integrated with other optical fiber devices and the like, and the fiber grating has mature manufacturing process, is easy to be connected with an optical fiber system, is convenient to use and maintain and has low cost, so the fiber grating has good practicability.
Preferably, a protective sleeve is arranged outside the optical fiber between the two optical fiber connecting parts.
In this scheme, set up the protective sheath and can protect the optic fibre deformation response section between two optic fibre connecting portion, avoid external environment to exert an influence to deformation response section, cause optic fibre force sensing device's output signal result inaccurate.
Preferably, glue is filled in the protective sleeve.
In this scheme, optic fibre in the protective sheath is by tensile back, because irritate glue in the protective sheath, even optic fibre is not straightened, also can make the deformation response section on the optic fibre produce corresponding deformation, can make the light signal that inside passes through change, can obtain corresponding power signal.
Preferably, the linkage monitoring system further comprises a signal monitoring device, and one end of the optical fiber force sensing device is electrically connected with the signal monitoring device through a signal wire;
the signal monitoring device is used for receiving and analyzing the optical signal returned from the optical fiber in the optical fiber force sensing device, and qualitatively and/or quantitatively judging the loosening condition of the bolt or the nut based on the analyzed result.
Preferably, the signal monitoring device is specifically configured to determine that the bolt or the nut is loosened when the optical signals returned by the two optical fiber force sensing devices connected to the same bolt or nut are changed.
In the scheme, the bolt or the nut can be judged to be loosened only if the optical fibers in the two optical fiber force sensing devices on the same bolt or nut are deformed, so that misjudgment caused by deformation of the optical fiber in one optical fiber force sensing device due to external factors is avoided, and real-time and accurate monitoring on the bolt or the nut of the wind driven generator is realized.
Preferably, two of the optical fiber connecting portions are fixed to two of the bolts or nuts, respectively, and while one of the optical fiber connecting portions is held stationary, the other optical fiber connecting portion urges the optical fiber to a tensioned state or a relaxed state when the bolt or nut is rotated in a loosening direction.
In this scheme, in order to make the deformation sensing section on the optical fiber in the optical fiber force sensing device be stretched or compressed to generate a deformation signal, the optical fiber force sensing device is required to be installed, so that the optical fiber tends to be in a tensioned state or a compressed state when the bolt or the nut rotates along the loosening direction.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the utility model.
The positive progress effects of the utility model are as follows: according to the linkage monitoring system for monitoring the loosening of the bolt or the nut, the bolt or the nut can be judged to be loosened only when two optical fiber force sensing devices on the same bolt or the same nut are deformed, misjudgment caused by the deformation of one optical fiber force sensing device due to external factors is avoided, the bolt or the nut of the wind driven generator can be accurately monitored in real time, the loosening of the bolt or the nut of the wind driven generator or the breakage of the bolt can be timely found, the timely maintenance is facilitated, the scientificity and the reliability of the routing inspection and maintenance of the wind driven generator are improved, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic view of the installation of an optical fiber force sensing device according to a preferred embodiment of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
FIG. 3 is a schematic structural diagram of an optical fiber force sensing device according to a preferred embodiment of the present invention.
FIG. 4 is a schematic view of the profile nut of the preferred embodiment of the present invention.
Description of reference numerals:
Mounting hole 2
Bolt 3
Optical fiber force sensing device 4
Optical fiber connecting part 42
Clamping part 52
Clamping groove 521
Detailed Description
The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.
As shown in fig. 1-4, the linkage monitoring system for monitoring the loosening of the bolt or the nut of the present invention includes an optical fiber force sensing device 4, wherein the optical fiber force sensing device 4 includes an optical fiber 41 and two optical fiber connecting portions 42; two optical fiber connection portions 42 are fixed to the optical fiber 41, and the length of the optical fiber 41 between the two optical fiber connection portions 42 is set to be greater than the linear distance between the two optical fiber connection portions 42; the optical fiber 41 between the two optical fiber connecting parts 42 is provided with a deformation induction section 43, the deformation induction section 43 generates deformation when the optical fiber connecting parts 42 receive external acting force, and the two optical fiber connecting parts 42 are respectively fixed on two bolts or nuts.
The optical fiber force sensing device 4 on the linkage monitoring system is fixed on the optical fiber 41 through the two optical fiber connecting parts 42, and the reserved length between the two optical fiber connecting parts 42 is used as a deformation sensing section 43 for qualitative and/or quantitative determination, when the optical fiber 41 is stretched or compressed, the deformation sensing section 43 can reflect or diffract light with specific wavelength in the optical fiber after being subjected to certain external force, so that optical signals of the light with corresponding wavelength in the optical fiber 41 are changed. When the monitoring system is used for monitoring the looseness of the bolt or the nut, the bolt or the nut can be judged to be loosened only if the two optical fiber force sensing devices 4 on the same bolt or the same nut are deformed, misjudgment caused by the deformation of one optical fiber force sensing device 4 due to external factors is avoided, the bolt or the nut of the wind driven generator can be accurately monitored in real time, the looseness of the bolt or the nut of the wind driven generator or the breakage condition of the bolt 3 can be found in time, the maintenance can be carried out in time, the scientificity and the reliability of the inspection and the maintenance of the wind driven generator are improved, and the maintenance cost is reduced.
In this embodiment, the technical solution of the present invention is further explained by monitoring the loosening of the bolt. The looseness of the bolt is a gradual change process, so that the length of the optical fiber 41 between the two optical fiber connecting parts 42 is set to be larger than the linear distance between the two optical fiber connecting parts 42, the redundant length can enable the bolt to be loosened and rotate for a certain length and then break the optical fiber, the reserved length can be that the bolt rotates for one circle or half circle, and the requirement that the potential safety hazard cannot be generated on the fixation of the wind driven generator is met.
In this embodiment, the linkage monitoring system further includes a fixing member for attaching the optical fiber connecting portion 42 to the bolt 3. It is convenient to mount the optical fibre force sensing device 4 to the bolt 3 to be monitored.
Wherein, the fixed part is profile modeling nut 5, and profile modeling nut 5's middle part is equipped with two at least joint portions 52 including the profile modeling installation department 51 with the polygon hole of the outside side looks adaptation of the head of bolt 3 on the circumferential direction of the outside limit of profile modeling installation department 51, and joint portion 52 is used for fixed optical fiber connecting portion 42. The fixing component is made into a form of a profiling nut 5 and is conveniently installed on the head of the bolt 3, and the two clamping parts 52 on the profiling nut 5 can conveniently install and fix the two optical fiber connecting parts 42 of the optical fiber force sensing device 4.
The clamping portion 52 of the profiling nut 5 is internally provided with a clamping groove 521, two sides of the clamping portion 52 are respectively provided with an open groove 522, the two open grooves 522 are positioned at two ends of the clamping groove 521 and communicated with the clamping groove 521, the clamping groove 521 is used for clamping and fixing the optical fiber connecting portion 42, and the optical fiber 41 penetrates through the two open grooves 522. The clamping portion 52 adopts the above structure to facilitate the optical fiber connection portion 42 to be clamped and fixed quickly, and at the same time, the optical fiber 41 is not affected to be stretched or compressed when the bolt 3 or the nut rotates.
In this embodiment, the deformation sensing section 43 is a fiber grating. The fiber grating is used as the deformation sensing section 43 of the optical fiber 41 because the fiber grating has the characteristics of small volume, good wavelength selectivity, no influence of nonlinear effect, insensitive polarization, large bandwidth range, small additional loss, miniaturized device, good coupling, capability of being integrated with other optical fiber devices and the like, and the fiber grating has mature manufacturing process, is easy to be connected with an optical fiber system, is convenient to use and maintain and has low cost, so the fiber grating has good practicability.
In order to reserve a margin when the optical fiber 41 is stretched and avoid a deformation signal generated by a slight change of the optical fiber 41 from affecting the use effect, the deformation sensing section 43 is configured as a bending section. Wherein, the deformation inducing section 43 may be configured in a spiral structure, an arc structure, or a wave structure, etc.
A protective jacket 44 is provided outside the optical fiber 41 between the two optical fiber connecting portions 42. The deformation sensing section 43 between the two optical fiber connecting portions 42 can be protected by the protective sleeve 44, so that the influence of the external environment on the deformation sensing section 43 is avoided, and the output signal result of the optical fiber force sensing device 4 is inaccurate. Wherein the protective sleeve 44 is made of an elastic material. In other embodiments, the protective sheath 44 may be made of plastic, metal, etc. as long as it can protect the deformation sensing section 43 of the optical fiber 41. In one example of the implementation, the protective sheath 44 is filled with glue, which generally needs to fill the protective sheath 44, so that the deformation sensing section 43 can be deformed correspondingly under the condition that the optical fiber 41 is stretched but not straightened, thereby generating the monitoring signal. The glue adopts flexible soft glue, such as silica gel, etc., to ensure that the protective sleeve has certain stretching length together.
The linkage monitoring system also comprises a signal monitoring device, wherein one end of an optical fiber 41 of the optical fiber force sensing device 4 is electrically connected with the signal monitoring device through a signal wire; the signal monitoring device is used for receiving and analyzing the optical signal returned from the optical fiber 41 in the optical fiber force sensing device 4, and judging the loosening condition of the bolt 3 based on the analyzed result, and specifically, qualitative or quantitative judgment can be carried out.
The following describes the process of qualitative or quantitative determination by drawing the deformation sensing section 43 of the optical fiber force sensing device when the bolt 3 is loosened: for example, a qualitative determination is made based on whether there is a signal in the analysis result, when the analysis result shows that there is no returned signal, the optical fiber force sensing device is pulled off, that is, the bolt 3 is loosened, or a qualitative determination is made based on whether the analysis result shows that there is a change in the returned optical signal, when there is a change, the optical fiber force sensing device is subjected to an external force, that is, the bolt 3 is loosened; for example, quantitative determination is performed based on the analysis result, the specific loosening angle of the bolt 3 can be known by analyzing the offset of the returned optical signal, and it can be shown that the optical fiber force sensing device is broken when no returned signal is displayed by the analysis result, and if the broken optical fiber force sensing device reserves a deformable amount, the loosening of the bolt 3 reaches a certain angle.
The following describes the process of qualitative or quantitative determination by compressing the deformation sensing section 43 in the optical fiber force sensing device when the bolt 3 is loosened: for example, qualitative judgment is performed based on whether the analysis result indicates that the returned optical signal changes, and when the analysis result indicates that the returned optical signal changes, the optical fiber force sensing device is subjected to an external force, that is, the bolt 3 is loosened; for example, quantitative determination is performed based on the analysis result, and the specific loosening angle of the bolt 3 can be known by analyzing the offset of the returned optical signal.
In this embodiment, since only one end of the optical fiber force sensing device 4 is connected to the signal monitoring device, when the laser is emitted to the optical fiber force sensing device 4, the laser will return to the signal monitoring device when encountering the deformation sensing section 43 on the optical fiber 41, and the signal monitoring device will analyze and display the returned laser signal, in this embodiment, only the emission sensitivity of the light of the optical fiber force sensing device 4 needs to be analyzed, wherein the emission of the laser to the optical fiber force sensing device 4 may be an integrated laser emitter in the signal monitoring device, or may be an external laser emitter.
The two optical fiber connecting portions 42 are fixed to the two bolts, respectively, preferably, the two optical fiber connecting portions 42 are fixed to the adjacent two bolts, respectively, and when one optical fiber connecting portion 42 is held stationary, the other optical fiber connecting portion 42 causes the optical fiber 41 to tend to be in a tensioned state when the adjacent bolt 3 is rotated in the loosening direction. In order to make the deformation sensing section 43 of the optical fiber 41 in the tension sensing device 4 of the optical fiber 41 be stretched to generate the deformation signal, it is required that the tension sensing device 4 of the optical fiber 41 is installed so that the optical fiber 41 tends to be in a tensioned state when the bolt 3 is rotated in the loosening direction, and that the tension sensing device 4 of the optical fiber 41 is installed so that the optical fiber 41 tends to be in a relaxed state when the deformation sensing section 43 of the optical fiber 41 in the tension sensing device 4 of the optical fiber 41 is compressed to generate the deformation signal.
In the process of monitoring by using a monitoring system, since there are many bolts 3 to be monitored, usually there are many optical fiber force sensing devices 4 installed corresponding to the bolts 3, in order to quickly know which bolt 3 is loosened, it is necessary to number each optical fiber force sensing device 4 and bolt 3, for example, the bolts 3 are numbered as L1, L2 to Ln, and the optical fiber force sensing devices 4 on both sides of the bolt 3 are numbered as T1 and T2, T2 and T3 to Tn and T1. The signal monitoring device is used for carrying out qualitative and/or quantitative judgment on the loosening condition of the bolt 3 or the nut corresponding to the optical fiber force sensing device according to an analytic result.
The signal monitoring device is used for determining the number of the optical fiber force sensing device according to the wavelength of the optical signal, wherein the corresponding relation between the wavelength of the returned optical signal and the number of the optical fiber force sensing device is preset in the signal monitoring device. When the laser is emitted into the optical fiber force sensing devices 4, the laser with the wavelength changing with time can be simultaneously sent to all the optical fiber force sensing devices 4, each optical fiber force sensing device 4 can receive the light with the same wavelength at the same time, but because the sensitive wavelength of the optical fiber grating of each optical fiber force sensing device 4 is different, each optical fiber force sensing device 4 can only reflect the light with one wavelength, for example, one optical fiber force sensing device 4 is only sensitive to the light with the wavelength of 332nm, and if the light with the wavelength of 343nm is received, the optical fiber force sensing device 4 cannot respond. It is assumed here that the optical fiber strain sensor numbered T1 can reflect light with a central wavelength of 332nm, the optical fiber strain sensor numbered T2 can reflect light with a central wavelength of 352nm, and when the central wavelength of the light received by the signal monitoring device is 332nm, the light reflected by the optical fiber force sensing device 4 numbered T1 can be determined.
In the present embodiment, in order to save the equipment cost, a swept-frequency laser is used to simultaneously transmit laser light whose wavelength changes with time to all the optical fiber force sensing devices 4.
The loosening of the bolts 3 can deform the optical fiber 41 in the corresponding optical fiber force sensing device 4, the optical fiber grating on the optical fiber 41 can shift the central wavelength of the optical signal with the wavelength when the optical signal returns, and the change of the central wavelength shift of the optical signal with different wavelengths displayed on the signal monitoring device is observed, namely, which bolt 3 is loosened can be quickly obtained by adopting the wavelength division multiplexing technology, so that the quick maintenance is facilitated.
Specifically, when a certain optical fiber force sensing device 4 is deformed by a tensile force, the center wavelength of the optical signal reflected by the certain optical fiber force sensing device is shifted, but the shift amount of the center wavelength of the optical signal reflected by each optical fiber force sensing device 4 is limited, and in this embodiment, it is ensured that the center wavelengths of the optical signals reflected by each optical fiber force sensing device 4 are not overlapped when the maximum shift occurs. Therefore, when the central wavelength of the returned optical signal received by the signal monitoring device is deviated, the serial number of the optical fiber force sensing device 4 reflecting the wavelength light can be determined; for example, since the center wavelength of the light received by the signal monitoring device is 334nm, and the wavelength 334nm is within the maximum shift range of the center wavelength of the light reflected by the optical fiber force sensing device 4 numbered T2, it can be confirmed that the optical fiber force sensing device 4 numbered T2 is deformed. However, in order to further confirm which bolt 3 is loosened, the optical fiber force sensing device 4 numbered T2 corresponds to the two bolts 3 numbered L1 and L2, and then confirms the other optical fiber force sensing device 4 on the bolt 3 numbered L1 and L2, if the other optical fiber force sensing device 4 numbered T3 on L2 is also deformed, the signal monitoring device can quickly know that the bolt numbered L2 is loosened, and a maintenance worker can only check the bolt 3 numbered L2 and maintain the bolt, without confirming the bolt one by one, so that the maintenance efficiency is greatly improved.
The signal monitoring device can simultaneously receive the optical signals returned by the two optical fiber force sensing devices 4 of the same bolt 3 and analyze the optical signals into the loosening data of the bolt 3 to be detected so as to judge the loosening condition of the bolt 3 to be detected. The use of two optical fibre force sensing devices 4 simultaneously improves the reliability of the test.
In this embodiment, a laser transmitter and a demodulator are integrated in the signal monitoring device, the laser transmitter is used for transmitting laser, and the demodulator is used for demodulating the optical signal returned from the optical fiber 41 and judging the change of the external quantity acting on the fiber grating according to the change of the reflection spectrum. The signal monitoring device is used for prestoring corresponding numbers of the optical fiber force sensing device 4 and the bolt 3 and corresponding relations between the numbers of the optical fiber force sensing device 4 and the sensitive wavelength thereof.
Wherein, every bolt 3 all has two optic fibre force sensing device 4 to monitor, if bolt 3 is the annular and arranges, as shown in fig. 1, have N bolt also only to need N optic fibre force sensing device 4 on the round of bolt installed part 1, if the bolt is not the annular and arranges, N bolt also only needs N +1 optic fibre force sensing device 4. When deformation signals generated by two optical fiber force sensing devices 4 connected to the same bolt 3 are changed, the bolt 3 can be judged to be loosened. When the judgment is carried out, only when two optical fiber force sensing devices 4 on the same bolt 3 generate deformation signals, the bolt 3 can be judged to be loosened, the misjudgment caused by the deformation signals generated by one of the optical fiber force sensing devices 4 due to external factors is avoided, and the real-time and accurate monitoring on the bolt 3 of the wind driven generator is realized.
While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications are within the scope of the utility model.
Claims (10)
1. A linkage monitoring system for monitoring bolt or nut looseness is characterized by comprising an optical fiber force sensing device, wherein the optical fiber force sensing device comprises an optical fiber and two optical fiber connecting parts;
two optical fiber connecting parts are fixed on the optical fiber, and the length of the optical fiber between the two optical fiber connecting parts is set to be larger than the linear distance between the two optical fiber connecting parts;
two be equipped with the deformation response section on the optic fibre between the optic fibre connecting portion, the deformation response section is set to the bending section, the deformation response section is in when optic fibre connecting portion receive external force the deformation, two optic fibre connecting portion fix respectively on two bolts or nuts.
2. A linkage monitoring system for monitoring loosening of a bolt or nut according to claim 1, further comprising a securing member for attaching the fiber optic connection to the bolt or nut.
3. The linkage monitoring system for monitoring the loosening of the bolt or the nut as claimed in claim 2, wherein the fixing member is a profiling nut, the middle part of the profiling nut comprises a profiling installation part of a polygonal inner hole matched with the head of the bolt or the outer side of the nut, at least two clamping parts are arranged along the circumferential direction of the outer side of the profiling installation part, and the clamping parts are used for fixing the optical fiber connection part.
4. The linkage monitoring system for monitoring the loosening of the bolt or the nut as claimed in claim 3, wherein a clamping groove is formed in the clamping portion, open grooves are respectively formed in two sides of the clamping portion, the two open grooves are located at two ends of the clamping groove and are communicated with the clamping groove, the clamping groove is used for clamping and fixing the optical fiber connecting portion, and the optical fiber penetrates through the two open grooves.
5. A linkage monitoring system for monitoring loosening of bolts or nuts according to claim 1 and wherein said deformation sensing section is a fiber grating.
6. A linkage monitoring system for monitoring loosening of bolts or nuts according to claim 1, characterised in that a protective sleeve is provided around said optical fibre between two of said optical fibre connections.
7. A linked monitoring system for monitoring the loosening of bolts or nuts as claimed in claim 6 wherein said protective sleeve is filled with glue.
8. The linkage monitoring system for monitoring the loosening of the bolt or the nut according to claim 1, further comprising a signal monitoring device, wherein one end of the optical fiber force sensing device is electrically connected with the signal monitoring device through a signal wire;
the signal monitoring device is used for receiving and analyzing the optical signal returned from the optical fiber in the optical fiber force sensing device, and qualitatively and/or quantitatively judging the loosening condition of the bolt or the nut according to the analyzed result.
9. The linkage monitoring system for monitoring the loosening of the bolt or the nut as claimed in claim 8, wherein the signal monitoring device is specifically configured to determine that the bolt or the nut is loosened when the optical signals returned by two optical fiber force sensing devices connected to the same bolt or nut are changed.
10. A linkage monitoring system for monitoring loosening of bolts or nuts according to any of claims 1-9 and wherein two said optical fibre attachment portions are secured to two said bolts or nuts respectively and one said optical fibre attachment portion, when held stationary, urges said optical fibre towards a tensioned or relaxed state when said bolts or nuts are rotated in a loosening direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2019111616931 | 2019-11-22 | ||
| CN201911161692 | 2019-11-22 | ||
| CN201911161693 | 2019-11-22 | ||
| CN2019111616927 | 2019-11-22 |
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| CN202011252222.4A Pending CN112834103A (en) | 2019-11-22 | 2020-11-11 | Linkage monitoring system and method for monitoring bolt or nut loosening |
| CN202022599900.6U Active CN215639896U (en) | 2019-11-22 | 2020-11-11 | Linkage monitoring system for monitoring loosening of bolt or nut |
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| CN202011252222.4A Pending CN112834103A (en) | 2019-11-22 | 2020-11-11 | Linkage monitoring system and method for monitoring bolt or nut loosening |
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| CN (2) | CN112834103A (en) |
| WO (1) | WO2021098880A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114739560A (en) * | 2022-03-10 | 2022-07-12 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113883016A (en) * | 2021-11-16 | 2022-01-04 | 西安热工研究院有限公司 | Real-time monitoring method and system for blade root bolt fracture of wind generating set blade |
| CN114963973A (en) * | 2022-04-13 | 2022-08-30 | 盐城市质量技术监督综合检验检测中心(盐城市产品质量监督检验所) | Bolt crack detection device and method based on fiber bragg grating array sensing film |
| CN115331398B (en) * | 2022-07-05 | 2023-05-16 | 中国长江电力股份有限公司 | Intelligent monitoring device and method for volute inlet bolt of hydroelectric generating set |
| CN116046356B (en) * | 2023-04-03 | 2023-06-13 | 深圳市城市公共安全技术研究院有限公司 | Unmanned aerial vehicle-based photovoltaic module detection method, unmanned aerial vehicle and storage medium |
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| JP2007178232A (en) * | 2005-12-27 | 2007-07-12 | Honda Motor Co Ltd | Method for measuring shearing load of fastening implement |
| CN200952964Y (en) * | 2006-06-23 | 2007-09-26 | 周智 | Non-external influence optical fiber grating temperature sensor |
| US8433160B2 (en) * | 2009-01-30 | 2013-04-30 | Cleveland Electric Laboratories | Smart fastener and smart insert for a fastener using fiber Bragg gratings to measure strain and temperature |
| CN104567998A (en) * | 2014-12-12 | 2015-04-29 | 中国航空工业集团公司北京长城计量测试技术研究所 | Optical fiber Bragg grating sensing principle-based temperature-self-compensating intelligent bolt |
| CN208420238U (en) * | 2018-08-20 | 2019-01-22 | 刘绍波 | A kind of FBG monitoring device of bolt stress |
| CN110220682B (en) * | 2019-05-30 | 2021-11-23 | 苏州热工研究院有限公司 | Monitoring device and monitoring method for monitoring bolt looseness |
| CN211042564U (en) * | 2019-11-22 | 2020-07-17 | 奥动新能源汽车科技有限公司 | Optical fiber force sensing device and system for monitoring bolt or nut looseness |
| CN211042563U (en) * | 2019-11-22 | 2020-07-17 | 奥动新能源汽车科技有限公司 | Linkage monitoring system for monitoring loosening of bolt or nut |
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2020
- 2020-11-11 CN CN202011252222.4A patent/CN112834103A/en active Pending
- 2020-11-11 CN CN202022599900.6U patent/CN215639896U/en active Active
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|---|---|---|---|---|
| CN114739560A (en) * | 2022-03-10 | 2022-07-12 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
| CN114739560B (en) * | 2022-03-10 | 2024-02-27 | 深圳市风行太保科技有限公司 | Fastening device, threaded fastener monitoring method, device, system and storage medium |
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| CN112834103A (en) | 2021-05-25 |
| WO2021098880A1 (en) | 2021-05-27 |
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Effective date of registration: 20220715 Address after: 201306 C, 888, west two road, Nanhui new town, Pudong New Area, Shanghai Patentee after: Feixun sensor technology (Shanghai) Co.,Ltd. Address before: 201307 2nd floor, building 2, 4766 Jiangshan Road, Nicheng Town, Pudong New Area, Shanghai Patentee before: AULTON NEW ENERGY AUTOMOTIVE TECHNOLOGY Group |