CN113008151A - Bolt or nut looseness monitoring device and system and optical fiber deformation sensor - Google Patents
Bolt or nut looseness monitoring device and system and optical fiber deformation sensor Download PDFInfo
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- CN113008151A CN113008151A CN202011511158.7A CN202011511158A CN113008151A CN 113008151 A CN113008151 A CN 113008151A CN 202011511158 A CN202011511158 A CN 202011511158A CN 113008151 A CN113008151 A CN 113008151A
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- bolt
- deformation sensor
- fiber deformation
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses a device and a system for monitoring the looseness of bolts or nuts, wherein the number of the bolts or nuts is at least two, and the bolts or nuts are used for being fastened on a base, and the device for monitoring the looseness comprises: an optical fiber deformation sensor; the optical fiber deformation sensor is provided with a deformation sensing section, and the deformation sensing section of the optical fiber deformation sensor is arranged to be located between two bolts or nuts, so that the deformation sensing section deforms when any one of the two bolts or nuts rotates. The bolt or nut looseness monitoring device and the bolt or nut looseness monitoring system can find the looseness and fracture conditions of adjacent fixing bolts or nuts in time so as to facilitate timely maintenance; meanwhile, the number of sensors is reduced, and the measurement accuracy is improved.
Description
Technical Field
The invention relates to a monitoring technology of adjacent fixed bolt or nut states, in particular to a bolt or nut looseness monitoring device and system and an optical fiber deformation sensor.
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 or nuts for fixing the large-scale wind driven generator is extremely large (more than 500 bolts are fixed on one large-scale wind driven generator), and the bolts or nuts fastened by threads on the wind driven generator are easy to loosen due to the extremely bad environment, and the loosening of the bolts or nuts can cause the damage and even collapse of the wind driven generator. 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 is loosened or broken cannot be found in time, and a large amount of time, manpower and material resources are consumed for polling each time, particularly for the offshore wind generating set, kilometers are deep into a coastline, the polling of the unit is inconvenient, the polling cost is high, and the like.
The existing displacement sensor can only detect single bolts or nuts, for example, only can detect the looseness of a single bolt group. For example, in patent application publication No. CN110220682A, a plurality of bolts are measured by one optical fiber, and a time-division multiplexing method is adopted, but the loosening of a certain bolt cannot be found in time. When a specific device, such as a wind turbine tower, includes a row of multiple bolt sets, it is costly and inefficient to perform the detection of a single bolt set.
Disclosure of Invention
The invention provides a bolt or nut looseness monitoring device and system, which aim to overcome the defect of bolt or nut looseness monitoring in the prior art and overcome the problems that the cost is high and the efficiency is low when the existing displacement sensor is used for monitoring a bolt group or a nut group individually.
The invention solves the technical problems through the following technical scheme:
a looseness monitoring device of bolts or nuts, the bolts or nuts being at least two in number and each being used for fastening on a base, the looseness monitoring device comprising:
an optical fiber deformation sensor;
the optical fiber deformation sensor is provided with a deformation sensing section, and the deformation sensing section of the optical fiber deformation sensor is arranged to be located between two bolts or nuts, so that the deformation sensing section deforms when any one of the two bolts or nuts rotates.
Preferably, two ends of the deformation sensing section of the optical fiber deformation sensor are respectively arranged between two adjacent or nonadjacent bolts or nuts.
Preferably, the looseness monitoring device further comprises a supporting device, and the supporting device is arranged on the base and is used for supporting the optical fiber deformation sensor;
the supporting devices are arranged on two adjacent or nonadjacent bolts or nuts, and the optical fiber deformation sensor is arranged between the supporting devices of the two adjacent or nonadjacent bolts or nuts, so that the deformation induction section is deformed under the relative acting force of the two supporting devices when any one of the two adjacent or nonadjacent bolts or nuts rotates.
Preferably, the looseness monitoring device further comprises a profiling nut;
the profiling nut is fixedly sleeved on the head of the bolt or the nut; the supporting device is fixedly arranged on the profiling nut.
Preferably, two opposite ends of the profiling nut are respectively provided with a protruding piece;
the convex sheet is provided with a groove, two ends of the optical fiber deformation sensor are provided with limiting parts, two ends of the optical fiber deformation sensor are respectively and fixedly arranged in the grooves at different ends of the adjacent profiling nuts, and the limiting parts are attached to the outer side wall of the groove of the convex sheet; or, the convex sheet is provided with a clamping part, the two ends of the optical fiber deformation sensor are fixedly provided with connecting parts, and the connecting parts at the two ends of the optical fiber deformation sensor are respectively clamped in the clamping parts at the different ends of the adjacent profiling nuts.
Preferably, the optical fiber deformation sensor comprises an optical fiber and a base member, the optical fiber is provided with a deformation sensing section, the optical fiber is accommodated in the base member, and the deformation sensing section is located in the base member;
the optical fiber deformation sensor is respectively connected to the two bolts or nuts through both ends of the base member.
Preferably, the looseness monitoring device further comprises a nut buckle;
the nut buckle is fixedly sleeved on the head of the bolt or the nut; the end part of the optical fiber deformation sensor is connected to the bolt or the nut through the nut buckle.
Preferably, the nut buckle comprises a body, the body is provided with a mounting hole matched and connected with the bolt or the nut, and the body is convexly provided with a tooth-shaped groove.
An optical fiber deformation sensor comprising:
an optical fiber having a deformation sensing section;
the optical fiber is accommodated in the base piece, and the deformation induction section is positioned in the base piece; the base piece is arranged to be connected with two bolts or nuts at two ends respectively, or the base piece is arranged to be fixed at one end and connected with the bolts or nuts at the other end; the bolt or the nut is used for being fastened on a base; the deformation induction section generates deformation when the bolt or the nut connected with the deformation induction section rotates.
Preferably, said base member comprises:
a first connecting portion at one end of the base member;
a second connecting portion located at the other end of the base member;
the base piece is connected to the two bolts or nuts through the first connecting part and the second connecting part respectively; or the base member is fixed by one of the first connecting portion and the second connecting portion, and the other connecting portion is connected to the bolt or the nut.
Preferably, said base member further comprises:
the third connecting part is connected between the first connecting part and the second connecting part and provided with an optical fiber groove, the optical fiber is contained in the optical fiber groove, the deformation sensing section is positioned in the optical fiber groove, and one end of the optical fiber penetrates through the first connecting part or the second connecting part.
Preferably, the first connecting part and/or the second connecting part comprise a clamping structure;
the clamping structural part is used for being matched with a nut buckle sleeved on the bolt or the nut in a buckling mode, so that the first connecting part and/or the second connecting part can be detachably connected to the bolt or the nut.
Preferably, the clamping structure comprises two clamping columns, one end parts of the two clamping columns are connected, and a deformation gap is formed between the two clamping columns.
Preferably, two opposite side surfaces of the two engaging columns are respectively provided with an outwardly protruding engaging tenon, and the engaging structure is engaged with the tooth-shaped groove on the nut buckle through the engaging tenons on the two sides, so that the first connecting portion and/or the second connecting portion can be detachably connected to the bolt or the nut.
Preferably, the top of the clamping structure member is provided with a dispensing slot, the optical fiber penetrates through the dispensing slot, and the optical fiber is embedded and fixed in the base member by filling the dispensing slot and the optical fiber slot with glue.
Preferably, a grating is arranged on the deformation induction section.
Preferably, the grating is a bragg grating.
A bolt or nut looseness monitoring system comprises at least one bolt or nut looseness monitoring device, a signal analysis device and a laser emission device;
the signal analysis device and the laser emission device are respectively in communication connection with the optical fiber deformation sensor in the loosening monitoring device;
the laser emitting device is used for emitting laser to the optical fiber deformation sensor; the signal analysis device is used for receiving and analyzing the optical signal returned by the optical fiber deformation sensor and judging the bolt or nut which is loosened according to the analysis result.
Preferably, a first corresponding relationship between the serial number of the optical fiber deformation sensor and the serial number of the bolt or the nut and a second corresponding relationship between the serial number of the optical fiber deformation sensor and the sensitive band are prestored in the signal analysis device;
the signal analysis device is used for analyzing the center wavelength of the optical signal returned by the optical fiber deformation sensor, determining the number of the optical fiber deformation sensor according to the center wavelength of the optical signal and the second corresponding relation, and determining the number of the bolt or the nut corresponding to the optical signal according to the number of the optical fiber deformation sensor and the first corresponding relation.
Preferably, the signal analysis device is further configured to calculate a loosening angle of the bolt or nut that loosens according to the analysis result;
the signal analysis device is also pre-stored with a third corresponding relation between the serial number of the optical fiber deformation sensor and the standard central wavelength of the sensitive waveband;
and the signal analysis device determines the standard central wavelength of the optical fiber deformation sensor according to the serial number of the optical fiber deformation sensor and the third corresponding relation, compares the central wavelength of the optical signal returned by the optical fiber deformation sensor with the standard central wavelength, and calculates the loosening angle generated by the bolt or the nut corresponding to the optical signal.
Preferably, the loosening monitoring system further comprises an alarm device; the alarm device is in communication connection with the signal analysis device;
the alarm device is used for receiving data uploaded by the signal analysis device, the data comprise the serial number of the bolt or the nut and the loosening angle generated by the bolt or the nut, and when the loosening angle exceeds a threshold value, an alarm signal corresponding to the serial number of the bolt or the nut is generated.
Preferably, the loosening monitoring system further comprises an alarm device; the alarm device is in communication connection with the signal analysis device;
and the alarm device is used for generating an alarm signal corresponding to the unreceived serial number of the bolt or the nut when the data uploaded by the signal analysis device is not received within a preset time period and the data comprises the serial number of the bolt or the nut.
A wind turbine tower comprises a wind turbine tower main body, at least two bolts or nuts installed on the wind turbine tower main body, and the loosening monitoring device for the bolts or the nuts in any one of the embodiments.
The positive progress effects of the invention are as follows: the bolt or nut looseness monitoring device and the bolt or nut looseness monitoring system provided by the invention realize bolt or nut looseness monitoring, can find bolt or nut looseness and fracture conditions in time so as to be convenient for maintenance in time, improve the scientificity and reliability of wind driven generator inspection maintenance, and realize the automatic monitoring function of the adjacent fixed bolt or nut state of the wind driven generator; the number of the sensors in the bolt or nut looseness monitoring device is the same as that of the tested bolts or nuts, but one bolt or nut can be monitored by two sensors at the same time, so that the normal operation of monitoring can be still guaranteed under the special condition that one sensor fails, and the purpose of improving the testing accuracy and reliability by adopting a small number of sensors is achieved.
Drawings
Fig. 1 is a schematic structural view of a bolt loosening monitoring device according to embodiment 1 of the present invention.
Fig. 2a and 2b are schematic structural views of a profiling nut of embodiment 1 of the invention.
Fig. 3 is a schematic diagram of the bolt rotation angle and the sensor sensing section stretching length in embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a device for monitoring loosening of a plurality of bolts according to embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of a bolt loosening monitoring device according to embodiment 2 of the present invention.
Fig. 6 is an overall structural diagram of a first angle at which the optical fiber deformation sensor according to embodiment 3 of the present invention is mounted on a bolt or a nut.
Fig. 7 is an overall structural diagram of a second angle at which the optical fiber deformation sensor according to embodiment 3 of the present invention is mounted on a bolt or a nut.
Fig. 8 is an enlarged schematic view of a structure of the engagement between the engaging structure and the nut buckle at a point a in fig. 7 according to embodiment 3 of the present invention.
Fig. 9 is a schematic structural diagram of a third angle at which a nut buckle is sleeved on a bolt or a nut in the optical fiber deformation sensor according to embodiment 3 of the present invention.
Fig. 10 is a schematic structural diagram of a fourth angle at which a nut is sleeved on a bolt or a nut in the optical fiber deformation sensor according to embodiment 3 of the present invention.
Fig. 11 is a schematic diagram showing a fifth angle structure of the base member of the optical fiber strain sensor according to embodiment 3 of the present invention.
Fig. 12 is a sixth-angle configuration diagram of the base member of the optical fiber deformation sensor according to embodiment 3 of the present invention.
Fig. 13 is a schematic structural view of a bolt or nut loosening monitoring system according to embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, a schematic structural diagram of a bolt looseness monitoring device according to embodiment 1 of the present invention, the bolt looseness monitoring device includes an optical fiber deformation sensor 1 and a supporting device 3, the optical fiber deformation sensor 1 has a deformation sensing section 12, a plurality of bolts to be monitored are used and are fastened to a base by a thread, in this embodiment, the bolts to be monitored are hexagon bolts, the head of the optical fiber deformation sensor is hexagonal, the deformation induction section 12 of the optical fiber deformation sensor is arranged between two adjacent hexagonal bolts, the deformation induction section 12 of the optical fiber deformation sensor is simultaneously tightly attached to one edge of the hexagonal head of the hexagonal bolt, when any one of the adjacent hexagon bolts is loosened, the hexagon head of the adjacent hexagon bolt rotates, the deformation sensing section 12 of the optical fiber deformation sensor is deformed, and the optical fiber deformation sensor 1 outputs a deformation signal to monitor that the bolt is loosened.
The term "fastened" in the present invention means that the bolt or nut is screwed to the base to be fastened releasably and detachably. The "bolt or nut" is not limited to itself, and the present invention also includes any mechanism having a screw thread or the like that can be rotatably connected and fastened to the base.
The head of the monitored bolt in the bolt looseness monitoring device of the embodiment can also be in a quadrangle shape or any other non-circular shape. The number and the arrangement mode of the optical fiber deformation sensors 1 in the bolt loosening monitoring device of the embodiment are not limited to the embodiment, and any mode of monitoring bolt loosening by the deformation of the deformation sensing section 12 of the optical fiber deformation sensor essentially falls within the protection scope of the present invention.
The looseness monitoring device further comprises a profiling nut 8, the profiling nut 8 is fixedly sleeved on the head of the tested bolt, the profiling nuts 8 are sleeved on all the heads of the tested bolt, and the profiling nuts 8 and 8L are sleeved on the heads of the adjacent tested bolts in the embodiment;
the supporting device 3 is fixedly arranged on the profiling nut 8, and the profiling nut structures sleeved on the head of all the tested bolts are the same as the profiling nut 8.
The two opposite ends of the profiling nut 8 are respectively provided with a convex sheet 9;
be equipped with recess 10 on the protruding piece 9, the both ends of optic fibre deformation sensor are equipped with spacing part 11, and the both ends of optic fibre deformation sensor are fixed respectively and are set up in the recess 10 on the different ends on adjacent profile modeling nut 8 and 8L, and spacing portion 11 is laminated with the lateral wall of the recess 10 on the protruding piece.
The convex sheet 9 of the embodiment can be further provided with a clamping part, the two ends of the optical fiber deformation sensor can be further fixedly provided with connecting parts, and the connecting parts at the two ends of the optical fiber deformation sensor are respectively clamped in the clamping parts at the different ends of the profiling nut 8.
Sensor installing support and strain induction point are done to profile modeling nut 8 in this embodiment, and the sensor installing support is hung in profile modeling nut 8 both sides, can take place rotatoryly when being surveyed the bolt not hard up, drives the profile modeling nut 8 that the cover was established on it simultaneously and rotates together, and the tensile action is done to the deformation response section of the optic fibre deformation sensor of pulling just fixed on it when profile modeling nut 8 is rotatory to make optic fibre deformation sensor send deformation signal. The profiling nut 8 and the supporting device 3 are integrally formed into a structure (an injection molding part or a thermal forming part), and the structure is formed by pouring a mold or hot-pressing the mold.
In the bolt looseness monitoring device, the optical fiber deformation sensors are fixedly arranged on the adjacent profiling nuts in a staggered mode.
As shown in fig. 2a, the profiling nut of embodiment 1 of the present invention is schematically configured. The opposite ends of the profiling nut are respectively provided with a convex sheet 9, the convex sheets 9 are provided with grooves 10, and the middle of the profiling nut is provided with a through hole 13 for sleeving the head of the fixing bolt.
As shown in fig. 2b, the profiling nut of embodiment 1 of the present invention is schematically configured. The profiling nut is provided with a buckle structure to prevent the profiling nut from slipping.
As shown in fig. 3, a schematic diagram of a bolt rotation angle and a sensor sensing section stretching length in embodiment 1 of the present invention is shown, when a detected bolt is loosened, the detected bolt rotates to drive a profiling nut to rotate, and the bolt is loosened to rotate counterclockwise. When the bolt rotates by 30 degrees, the profiling nut is driven to rotate by 30 degrees, so that the deformation sensing section of the optical fiber deformation sensing is stretched and deformed by 2.63 mm; when the bolt continues to rotate, the deformation sensing section of the optical fiber deformation sensing is continuously elongated and even broken.
As shown in fig. 4, a schematic structural view of a looseness monitoring device for a plurality of bolts according to embodiment 1 of the present invention.
The principle of monitoring the loosening of the bolt by the bolt loosening monitoring device in the embodiment 1 of the invention is as follows:
the profiling nuts 8 are sleeved on the head of the tested bolt, mounting clamping positions of the optical fiber deformation sensors are arranged on the profiling nuts 8, the optical fiber deformation sensors 1 on two adjacent profiling nuts 8 and 8L are directly hung in two phases after the bolt is fixed, the two phases are mutually restrained, and the position of a loosened bolt is judged through a strain point. The deformation sensing section of the optical fiber deformation sensor 1 is not stressed under the condition that the bolt is not loosened, only weak expansion with heat and contraction with cold under the influence of temperature are achieved, and at the moment, the deformation signal output by the optical fiber deformation sensor is zero or outputs a weak deformation signal.
When the tested bolt is loosened, the bolt rotates to drive the profiling nut 8 to rotate, and the bolt is loosened to rotate anticlockwise. For example, when the tested bolt loosens, the bolt loosens and rotates counterclockwise, and the deformation sensing section of the optical fiber deformation sensor 1 is elongated by 2.6mm according to the calculation of 30 degrees of rotation, and if two adjacent bolts loosen simultaneously, the deformation sensing section of the sensor is elongated more, and even a snapping situation occurs. At this time, the optical fiber deformation sensor outputs a large deformation signal or the optical fiber deformation sensor outputs a signal missing, which indicates that the bolt is loosened.
Because any one of the adjacent profiling nuts 8 and 8L rotates, the deformation sensing section of the optical fiber deformation sensor 1 is deformed or broken, at the moment, the conditions of the optical fiber deformation sensors 1L and 1R adjacent to the left and right of the optical fiber deformation sensor 1 need to be checked simultaneously, if the optical fiber deformation sensor 1L on the adjacent left outputs deformation signals or signals lack and the optical fiber deformation sensor 1R on the adjacent right does not output deformation signals or signals lack, it is determined that the bolt where the profiling nut 8L between the optical fiber deformation sensor 1 and the optical fiber deformation sensor 1L on the adjacent left is loosened.
According to the bolt looseness monitoring device in the embodiment 1, two optical fiber deformation sensors are used for monitoring the same bolt, sensing points on two sides of the bolt are monitored, if the deformation signal variation quantity output by two adjacent optical fiber deformation sensors is the same or the signals are lost, the fact that the tested bolt is loosened is shown, background analysis can be conducted, and the test result is more reliable. If the three continuous optical fiber deformation sensors output large deformation signals or signals are lost, the two continuous bolts are loosened.
The number of the sensors in the bolt looseness monitoring device is only one more than that of the bolts to be tested, but one bolt can be monitored by two sensors at the same time, so that the normal operation of monitoring can be still guaranteed under the special condition that one sensor fails, and the purpose of improving the testing accuracy and reliability by adopting fewer sensors is achieved.
The loosening monitoring device for the bolt is also suitable for monitoring the loosening of the nut.
Example 2
Fig. 5 is a schematic structural view of a bolt loosening monitoring device according to embodiment 2 of the present invention.
In the bolt looseness monitoring device of the embodiment, the tested bolt surrounds the edge of the circular base 25 for one circle, the supporting device 20 is arranged at the same side of the profiling nut 23, and the structure of the supporting device 20 is the same as that of the supporting device 3 in the embodiment 1. The two ends of the optical fiber deformation sensor 21 are respectively and fixedly arranged on the supporting devices of the adjacent profiling nuts 23 and 24, and the optical fiber deformation sensor 21 is arranged around the edge of the base 25. After the bolts are fixed, the optical fiber deformation sensors 21 on the two adjacent profiling nuts 23 and 24 are simultaneously restrained by the profiling nuts 23 and 24, the deformation induction section of the optical fiber deformation sensor 21 can be deformed or broken by rotating any one of the profiling nuts 23 and 24, the conditions of the optical fiber deformation sensors adjacent to the left and the right of the optical fiber deformation sensor 21 need to be checked at the same time, and if the optical fiber deformation sensor on the adjacent left outputs a deformation signal or signal loss and the optical fiber deformation sensor on the adjacent right does not output a deformation signal or signal loss, the bolt where the profiling nut between the optical fiber deformation sensor 21 and the optical fiber deformation sensor on the adjacent left is loosened is determined. The optical fiber deformation sensor is arranged around the edge of the base 25 according to the arrangement mode of the optical fiber deformation sensor 21 and the optical fiber deformation sensor 22.
According to the bolt looseness monitoring device in the embodiment 2, two optical fiber deformation sensors are used for monitoring the same bolt, sensing points on two sides of the bolt are monitored, if the deformation signal variation quantity output by two adjacent optical fiber deformation sensors is the same or the signals are lost, the fact that the tested bolt is loosened is shown, background analysis can be conducted, and the test result is more reliable. If the three continuous optical fiber deformation sensors output large deformation signals or signals are lost, the two continuous bolts are loosened.
The number of the sensors in the bolt looseness monitoring device is only one more than that of the bolts to be tested, but one bolt can be monitored by two sensors at the same time, so that the normal operation of monitoring can be still guaranteed under the special condition that one sensor fails, and the purpose of improving the testing accuracy and reliability by adopting fewer sensors is achieved.
The loosening monitoring device for the bolt is also suitable for monitoring the loosening of the nut.
Example 3
The loosening monitoring device for bolts or nuts of the present embodiment differs from embodiment 1 or embodiment 2 in the connection between the optical fiber deformation sensor 1 and two bolts or nuts.
The optical fiber deformation sensor 1 used in the present embodiment includes an optical fiber 4 and a base member 5, as shown in fig. 11. Optic fibre 4 has deformation response section 12, and optic fibre 4 holding is in base piece 5, and deformation response section 12 is located base piece 5, is equipped with the grating on the deformation response section 12, specifically can select for use the Bragg grating. The optical fiber deformation sensor 1 is connected to two bolts or nuts through both ends of the base member 5, respectively. The optical fiber 4 is accommodated in the base part 5, so that the base part 5 has a certain protection effect on the optical fiber 4, the optical fiber 4 is prevented from being damaged in the installation process, or the aging degree of the optical fiber 4 in the open-air use environment is reduced, and the service life of the optical fiber 4 is prolonged.
Specifically, the base member 5 includes: a first connecting portion 50 and a second connecting portion 51, the first connecting portion 50 being located at one end of the base member 5; the second connecting portion 51 is located at the other end of the base member 5. The base member 5 is connected to two bolts or nuts by a first connecting portion 50 and a second connecting portion 51, respectively. The two bolts or nuts may be adjacent or not adjacent, but it is preferable that the base member 5 is connected to the adjacent two bolts or nuts through the first connecting portion 50 and the second connecting portion 51, respectively, for convenience of installation and maintenance. So set up, as long as the quantity of optic fibre deformation sensor 1 is the same with the quantity of bolt or nut, just can ensure to be connected with two optic fibre deformation sensor 1 on every bolt or nut, even one of them optic fibre deformation sensor 1 damages, still another optic fibre deformation sensor 1 can use, reduces the probability of inefficacy.
In other exemplary embodiments, the base member 5 is fixed by one of the first connecting portion 50 and the second connecting portion 51, and the other is connected to a bolt or a nut. That is, one of the first connecting portion 50 and the second connecting portion 51 of the base member 5 is fixed to the base 2, and the other of the first connecting portion 50 and the second connecting portion 51 is connected to a bolt or a nut. In this embodiment, the optical fiber deformation sensor 1 is disposed in one-to-one correspondence with the bolt or the nut, and once the bolt or the nut is loosened, the loosened bolt or nut can be quickly, directly and accurately determined according to the correspondence.
To facilitate installation of the optical fiber 4 into the base member 5, the base member 5 further includes: the third connection portion 52 is connected between the first connection portion 50 and the second connection portion 51, the third connection portion 52 has a fiber groove 553, the optical fiber 4 is accommodated in the fiber groove 553, the deformation sensing section 12 is located in the fiber groove 553, and one end of the optical fiber 4 penetrates through the first connection portion 50 or the second connection portion 51. Specifically, one end of the third connection portion 52 is connected to the first connection portion 50, and the other end of the third connection portion 52 is connected to the second connection portion 51. The optical fiber 4 sequentially passes through the first connection portion 50, the third connection portion 52 and the second connection portion 51, the optical fiber 4 is placed in the optical fiber groove 553, the deformation sensing section 12 is also located in the optical fiber groove 553, and two ends of the optical fiber 4 are respectively placed in the first connection portion 50 and the second connection portion 51.
In order to conveniently connect and mount the first connecting portion 50 and the second connecting portion 51 with the nut buckle 54, a clamping structure 55 is disposed on the first connecting portion 50 and the second connecting portion 51, and the clamping structure 55 can be matched with the nut buckle 54 sleeved on the bolt or the nut. This arrangement is preferably applied to the connection of the optical fiber deformation sensor 1 between two bolts or nuts. However, when only one end of the optical fiber strain sensor 1 is connected to a bolt or a nut and the other end is fixed to the base 2, the engaging member 55 may be provided on one of the first connecting portion 50 and the second connecting portion 51 connected to the bolt or the nut, and the other end is directly fixed to the base 2.
Specifically, the engaging structure 55 includes two engaging posts 550, one end of each of the two engaging posts 550 is connected, and a deformation gap is formed between the two engaging posts 550. And a deformation gap is formed to provide a space for the two engagement posts 550 to deform. In order to vertically connect the locking post 550 to the base member 5, the locking post 550 preferably extends vertically outward from the bottom of the locking structure 55. Further, the engaging structure 55 has a glue dispensing groove 555 at the top, and the optical fiber 4 penetrates the glue dispensing groove 555 and is buried and fixed in the base member 5 by filling the glue dispensing groove 555 and the optical fiber groove 553.
In this embodiment, as shown in fig. 9, the nut buckle 54 includes a body, a mounting hole is formed on the body, the mounting hole is connected to the bolt or the nut, and a tooth-shaped groove 540 is further formed on the body and is used for being matched with the clamping structure, so as to facilitate adjustment of the connection distance between the two ends of the optical fiber and prevent free movement of the optical fiber connection end. One specific structure of the tooth-shaped groove 540 is shown in fig. 9, and the tooth-shaped groove 540 includes an outer gear 542 and an inner gear 541 concentric with the mounting hole, the inner gear 541 surrounds the outer gear 542, and the tooth-shaped groove 540 is formed between the outer gear 542 and the inner gear 542. Two opposite side surfaces of the two engaging columns 550 are respectively provided with an outwardly protruding engaging tenon, and the engaging structure 55 is engaged with the inner gear 541 and the outer gear 542 of the nut buckle 54 through the engaging tenons on the two sides, so that the first connecting portion 50 and/or the second connecting portion 51 can be detachably connected to the bolt or the nut. The internal gear 541 and the external gear 542 are provided to make the snap connection between the nut button 54 and the snap structure 55 tighter.
Illustratively, as shown in fig. 11 to 12, the latch includes a first latch 551, a second latch 552, a third latch 553, and a fourth latch 554, the first latch 551 and the second latch 552 are connected to one of the two latching columns 550, the third latch 553 and the fourth latch 554 are connected to the other of the two latching columns 550, and a groove is formed between the first latch 551 and the second latch 552 and between the third latch 553 and the fourth latch 554. When the nut buckle 54 is engaged with the engaging structure 55, the first engaging tenon 551 and the second engaging tenon 552 engage with the inner gear 541, the third engaging tenon 553 and the fourth engaging tenon 554 engage with the outer gear 542, the protruding portion of the tooth-shaped groove 540 is received in the groove, and the engaging post 550 is received in the tooth-shaped groove 540 formed between the outer gear 542 and the inner gear 541 which are concentric.
According to the invention, the nut buckle 54 is arranged on the bolt or the nut, and the optical fiber deformation sensor 1 is buckled with the nut buckle 54 through the base piece 5, so that the installation and the maintenance are more convenient. And an optical fiber deformation sensor can be arranged on one or more bolts or nuts, so that each bolt or nut can be monitored, monitoring points are more, and each bolt or nut is accurately positioned. And the adjacent bolts or nuts are installed in parallel, so that the installation and monitoring reliability is improved.
Example 4
Fig. 13 is a schematic structural view of a bolt or nut loosening monitoring system according to embodiment 4 of the present invention.
The bolt or nut looseness monitoring system of the present embodiment includes several bolt or nut looseness monitoring devices 100 of the above embodiments. In addition, the loosening monitoring system further comprises a signal analysis device 200 and a laser emission device 300. The laser emitting device 300 is in communication connection with an optical fiber deformation sensor in the loosening monitoring device 100; the laser emitting device 300 is used for emitting laser to the optical fiber deformation sensor.
The signal analysis device 200 is in communication connection with an optical fiber deformation sensor in the loosening monitoring device 100; the signal analysis device 200 is configured to receive and analyze an optical signal returned by the optical fiber deformation sensor, and determine a bolt or a nut that is loose according to an analysis result. Namely, the signal analyzer 200 is configured to receive and analyze a change in reflected light generated by the laser passing through the deformation sensing section of the optical fiber deformation sensor, and determine the tightness of the bolt or the nut according to an analysis result.
The communication connection between the signal analysis device 200 and the optical fiber deformation sensor may be a wired communication connection. Illustratively, the signal analyzer 200 includes a controller (not shown) connected to the optical fiber 4 via an optical cable.
In addition, the bolt loosening monitoring system in this embodiment further includes a host (not shown in the figure), which is connected to the controller through a network cable, and is configured to receive the detection result sent by the controller.
The signal analysis device 200 is pre-stored with a first corresponding relationship between the serial number of the optical fiber deformation sensor and the serial number of the bolt, a second corresponding relationship between the serial number of the optical fiber deformation sensor and the sensitive waveband, and a third corresponding relationship between the serial number of the optical fiber deformation sensor and the standard center wavelength of the sensitive waveband.
Each optical fiber deformation sensor has sensitivity corresponding to light with a specific wavelength, and the sensitivity refers to the reflection or diffraction of the optical fiber deformation sensor to light energy with a specific wavelength.
In this embodiment, the signal analyzer 200 uses a frequency-sweeping laser, has a function of fast wavelength scanning, can work on any selectable wavelength, performs linear wavelength scanning at a specified speed from a specified start wavelength to a specified end wavelength, and analyzes an optical signal returned by the optical fiber strain sensor using the frequency-sweeping laser, so as to obtain a center wavelength of the optical signal. When the optical fiber deformation sensor receives the laser emitted by the laser emitting device 300, the optical fiber deformation sensor reflects or diffracts light with a specific wavelength. The signal analysis device 200 analyzes the received optical signal returned by the optical fiber deformation sensor, and when the central wavelength of the optical signal returned by the optical fiber deformation sensor is scanned, the second corresponding relationship between the number of the optical fiber deformation sensor and the sensitive wavelength band is searched, and the sensitive wavelength band in which the central wavelength is located is searched to determine the number of the optical fiber deformation sensor. And determining the number of the bolt by searching the first corresponding relation between the number of the optical fiber deformation sensor and the number of the bolt.
The signal analyzer 200 is further configured to calculate a loosening angle of the bolt that is loosened according to the optical signal returned by the optical fiber deformation sensor. The signal analysis device 200 compares the center wavelength of the optical signal returned by the optical fiber deformation sensor with the standard center wavelength of the sensitive waveband according to the center wavelength of the optical signal returned by the optical fiber deformation sensor, calculates the loosening angle generated by the corresponding bolt, determines the number of the optical fiber deformation sensor by searching the third corresponding relationship between the number of the optical fiber deformation sensor and the standard center wavelength of the sensitive waveband, and determines the loosening angle generated by the corresponding bolt.
The bolts are provided with numbers such as L1, L2 to Ln when being installed; each optical fiber deformation sensor is also provided with numbers such as T1a, T2a to T (n +1) a; bolt L1 is disposed between optical fiber deformation sensors T1a and T2a, bolt L2 is disposed between optical fiber deformation sensors T2a and T3a, and bolt Ln is disposed between optical fiber deformation sensors Tna and T (n +1) a. The optical fiber deformation sensor with the number T1a can reflect or diffract light with the wavelength of 332nm, and the optical fiber deformation sensor with the number T2a can reflect or diffract light with the central wavelength of 352 nm. Therefore, when the signal analysis device 200 analyzes that the center wavelength of the received optical signal returned by the optical fiber deformation sensor is 332nm, which sensitive band the 332nm is in is searched, and then the optical fiber deformation sensor with the number of T1a can be determined through the first corresponding relationship, so as to determine the number of the optical fiber deformation sensor, and then the optical fiber deformation sensor with the number of T2a is determined in the same way. The optical fiber deformation sensors numbered T1a, T2a simultaneously monitor the loosening of the bolt numbered L1, the optical fiber deformation sensors numbered T2a and T3a simultaneously monitor the loosening of the bolt numbered L2, and so on, the optical fiber deformation sensors numbered Tna and T (n +1) a simultaneously monitor the loosening of the bolt numbered Ln.
When a certain optical fiber deformation sensor is deformed by tensile force due to the fact that a corresponding bolt is loosened, the central wavelength of an optical signal reflected by the certain optical fiber deformation sensor can be shifted, but the shift amount of the central wavelength of the optical signal reflected by each optical fiber deformation sensor is limited, and in this embodiment, it is ensured that the central wavelength of the optical signal reflected by each optical fiber deformation sensor cannot coincide with each other when the central wavelength of the optical signal reflected by each optical fiber deformation sensor is shifted to the maximum. Therefore, when the center wavelength of the optical signal returned by the optical fiber deformation sensor received by the signal analysis device 200 is shifted, the number of the optical fiber deformation sensor reflecting the light can be determined; for example, the signal analysis device 200 may confirm that the optical fiber strain sensor numbered T1a is deformed in the first correspondence relationship that the center wavelength of the optical signal returned by the optical fiber strain sensor is 334nm, and the maximum deviation range of the center wavelength of the optical signal reflected by the optical fiber strain sensor numbered T1a is the wavelength 334 nm. And then, determining that the standard central wavelength of the sensitive waveband of the optical fiber deformation sensor with the number of T1a is 332nm by searching for a third corresponding relation, and subtracting the standard central wavelength of the sensitive waveband from the central wavelength of an optical signal returned by the optical fiber deformation sensor with the number of T1a to obtain that the optical fiber deformation sensor generates 2nm deformation, thereby obtaining that the bolt loosens by 5 degrees. When the optical fiber deformation sensor with the number of T3a deforms or loses signals, bolts with the number of L2 or L3 are predicted to loosen, at the moment, which bolt is loosened needs to be determined according to the condition of the optical fiber deformation sensor with the number of adjacent optical fibers, and if the optical fiber deformation sensor with the number of T2a deforms or loses signals, and meanwhile, the optical fiber deformation sensor with the number of T4a does not deform or lose signals, the bolt with the number of L2 is determined to loosen; if the optical fiber deformation sensor with the number of T2a is not deformed or loses signals, and the optical fiber deformation sensor with the number of T4a is deformed or loses signals, the bolt with the number of L3 is determined to be loosened, and therefore, which bolt is loosened is determined.
Compared with the time-sharing multiplexing mode in the prior art, the invention realizes continuous and short-time frequency-division detection by adopting the frequency-sweeping laser, and positions the corresponding optical fiber deformation sensor through the central wavelength to determine the position of the loosened bolt, so that the method is not limited by the time interval of time-sharing multiplexing, has high efficiency and can find problems in time.
The bolt loosening monitoring system in the embodiment further comprises an alarm device 400, wherein the alarm device 400 is in wireless communication connection with the signal analysis device 200; the data analyzed by the signal analysis device 200 includes the number of the bolt and the loosening angle generated by the bolt; the data analyzed by the signal analysis device 200 is uploaded to the alarm device 400, the alarm device 400 judges whether the loosening angle generated by the bolt exceeds a preset threshold value, and if the loosening angle exceeds the preset threshold value, the alarm device 400 generates an alarm signal corresponding to the number of the bolt; if the alarm device 400 does not receive the data uploaded by the signal analysis device 200 within the preset time period, assuming that the preset time is 10 seconds, an alarm signal corresponding to the number of the bolt that is not received will be generated. If the bolt is loosened slightly, the deformation sensing section of the optical fiber deformation sensor is not broken and deformed, and at the moment, the signal analysis device 200 receives a deformation signal output by the optical fiber deformation sensor, so that the deformation sensing section of the optical fiber deformation sensor is stretched and deformed by 2.6mm when the bolt rotates by 30 degrees; when the bolt continues to rotate, the deformation sensing section of the optical fiber deformation sensing is continuously elongated and even broken. The threshold value of the loosening angle of the preset bolt is 5 degrees, when the loosening angle received by the alarm device 400 is larger than 5 degrees, the bolt is considered to be loosened, the alarm device 400 can generate an alarm signal and send the alarm signal to an operator, the operator sends a maintenance instruction, and meanwhile, the follow-up loosening condition is monitored. If a bolt is not flexible, the deformation induction sections of the optical fiber deformation sensors on two sides of the bolt are driven to be stretched and deformed, the deformation induction sections of the stretched optical fiber deformation sensors are broken at the limit, a signal source signal is lost at the moment, and the signal analysis device 200 detects the signal loss. If the signal analysis device 200 detects that the signal output by the optical fiber deformation sensor is missing, the deformation sensing section of the optical fiber deformation sensor is broken, the corresponding bolt is indicated to be greatly loosened, the maintenance is needed and the sensor is replaced, at the moment, the signal analysis device 200 determines the number of the normal optical fiber deformation sensor according to the received optical signal returned by the optical fiber deformation sensor, the number of the optical fiber deformation sensor which is broken is determined, the bolt of a specific certain number or a certain number is determined to be loosened, the alarm device 400 gives an early warning to an operator, and the operator sends a maintenance instruction. Under normal conditions, one bolt can be loosened continuously, and the optical fiber deformation sensor can continuously detect deformation data, so that when the bolt loosening angle is monitored to be small, the optical fiber deformation sensor can be maintained and recorded at first, and monitoring is continued. Moreover, if one bolt loosens, the other bolts may loosen at the same time, and at this time, the signal analyzer 200 may record all the loosening information of all the bolts.
The not hard up monitoring system of bolt of this embodiment, at key bolts such as fan blade, unable adjustment base, with the optic fibre deformation sensor that more one than the bolt number of being surveyed, arrange this optic fibre deformation sensor in the middle of two adjacent bolts, install one on two adjacent bolts additional with nut profile modeling cap or profile modeling nut, carry out the not hard up monitoring of bolt. The nut profiling cap or the profiling nut rotates along with the loosening of the bolt, so that deformation induction sections of optical fiber deformation sensors on two sides of the detected bolt are deformed and even broken, the optical fiber deformation sensors transmit deformation signals to the signal analysis device 200, the signal analysis device 200 transmits signals of each point to a fan operator through Wi-Fi (Wireless Fidelity, action hotspot) signals to perform data analysis, problems are found in time, and the fan is maintained after early warning without blind and purposeful maintenance.
The number of the sensors in the bolt looseness monitoring device is only one more than that of the bolts to be tested, but one bolt can be monitored by two sensors at the same time, so that the normal operation of monitoring can be still guaranteed under the special condition that one sensor fails, and the purpose of improving the testing accuracy and reliability by adopting fewer sensors is achieved.
Example 5
The embodiment 5 of the invention discloses a wind turbine tower cylinder which comprises a wind turbine tower cylinder main body, at least two bolts or nuts arranged on the wind turbine tower cylinder main body and a bolt or nut looseness monitoring device according to any one of the embodiments, so that the bolt or nut delivery condition on the wind turbine tower cylinder can be monitored in real time, and the scientificity and reliability of routing inspection and maintenance of a wind driven generator are improved. The looseness monitoring device can be arranged at the positions of fan blades, a fixed base, a tower barrel flange connection and the like.
While specific embodiments of the invention 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 invention 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 invention, and these changes and modifications are within the scope of the invention.
Claims (23)
1. A loosening monitoring device of bolts or nuts, the number of the bolts or nuts being at least two and each being used for fastening on a base, characterized by comprising:
an optical fiber deformation sensor;
the optical fiber deformation sensor is provided with a deformation sensing section, and the deformation sensing section of the optical fiber deformation sensor is arranged to be located between two bolts or nuts, so that the deformation sensing section deforms when any one of the two bolts or nuts rotates.
2. The device for monitoring the loosening of the bolt or the nut as claimed in claim 1, wherein two ends of the deformation sensing section of the optical fiber deformation sensor are respectively arranged between two adjacent or nonadjacent bolts or nuts.
3. The device for monitoring the loosening of a bolt or nut as claimed in claim 1, further comprising a support means provided on the base for supporting the optical fiber deformation sensor;
the supporting devices are arranged on two adjacent or nonadjacent bolts or nuts, and the optical fiber deformation sensor is arranged between the supporting devices of the two adjacent or nonadjacent bolts or nuts, so that the deformation induction section is deformed under the relative acting force of the two supporting devices when any one of the two adjacent or nonadjacent bolts or nuts rotates.
4. A device for monitoring the loosening of a bolt or nut as defined in claim 3, further comprising a profiling nut;
the profiling nut is fixedly sleeved on the head of the bolt or the nut; the supporting device is fixedly arranged on the profiling nut.
5. A device for monitoring the loosening of a bolt or nut as claimed in claim 4, wherein said contoured nut is provided with a tab at each of opposite ends;
the convex sheet is provided with a groove, two ends of the optical fiber deformation sensor are provided with limiting parts, two ends of the optical fiber deformation sensor are respectively and fixedly arranged in the grooves at different ends of the adjacent profiling nuts, and the limiting parts are attached to the outer side wall of the groove of the convex sheet; or, the convex sheet is provided with a clamping part, the two ends of the optical fiber deformation sensor are fixedly provided with connecting parts, and the connecting parts at the two ends of the optical fiber deformation sensor are respectively clamped in the clamping parts at the different ends of the adjacent profiling nuts.
6. The device for monitoring loosening of a bolt or nut of claim 1, wherein said optical fiber deformation sensor comprises an optical fiber and a base member, said optical fiber having a deformation sensing section, said optical fiber being received in said base member, said deformation sensing section being located in said base member;
the optical fiber deformation sensor is respectively connected to the two bolts or nuts through both ends of the base member.
7. A play monitoring device of a bolt or nut according to claim 6,
the loosening monitoring device also comprises a nut buckle;
the nut buckle is fixedly sleeved on the head of the bolt or the nut; the end part of the optical fiber deformation sensor is connected to the bolt or the nut through the nut buckle.
8. The device for monitoring the loosening of the bolt or the nut as claimed in claim 7, wherein the nut buckle comprises a body, the body is provided with a mounting hole matched and connected with the bolt or the nut, and the body is convexly provided with a tooth-shaped groove.
9. An optical fiber deformation sensor, comprising:
an optical fiber having a deformation sensing section;
the optical fiber is accommodated in the base piece, and the deformation induction section is positioned in the base piece; the base piece is arranged to be connected with two bolts or nuts at two ends respectively, or the base piece is arranged to be fixed at one end and connected with the bolts or nuts at the other end; the bolt or the nut is used for being fastened on a base; the deformation induction section generates deformation when the bolt or the nut connected with the deformation induction section rotates.
10. The optical fiber deformation sensor according to any one of claims 6 or 9, wherein the base member includes:
a first connecting portion at one end of the base member;
a second connecting portion located at the other end of the base member;
the base piece is connected to the two bolts or nuts through the first connecting part and the second connecting part respectively; or the base member is fixed by one of the first connecting portion and the second connecting portion, and the other connecting portion is connected to the bolt or the nut.
11. The optical fiber deformation sensor according to claim 10 wherein the base member further comprises:
the third connecting part is connected between the first connecting part and the second connecting part and provided with an optical fiber groove, the optical fiber is contained in the optical fiber groove, the deformation sensing section is positioned in the optical fiber groove, and one end of the optical fiber penetrates through the first connecting part or the second connecting part.
12. The optical fiber deformation sensor according to claim 10 wherein the first connection portion and/or the second connection portion includes a snap-fit structure;
the clamping structural part is used for being matched with a nut buckle sleeved on the bolt or the nut in a buckling mode, so that the first connecting part and/or the second connecting part can be detachably connected to the bolt or the nut.
13. The optical fiber deformation sensor according to claim 12 wherein the snap structure comprises two snap posts, one end of each of the two snap posts is connected, and a deformation gap is formed between the two snap posts.
14. The optical fiber deformation sensor according to claim 13, wherein two opposite side surfaces of the two engaging posts are respectively provided with a tenon protruding outward, and the engaging structure is respectively engaged with the tooth-shaped groove of the nut buckle through the tenons at the two sides, so that the first connecting portion and/or the second connecting portion can be detachably connected to the bolt or the nut.
15. The optical fiber deformation sensor according to claim 12, wherein the engaging structure has a glue dispensing groove at a top portion thereof, the optical fiber penetrates through the glue dispensing groove, and the optical fiber is embedded and fixed in the base member by filling glue in the glue dispensing groove and the optical fiber groove.
16. The optical fiber deformation sensor according to claim 9, wherein a grating is provided on the deformation sensing section.
17. The optical fiber deformation sensor according to claim 16, wherein the grating is a bragg grating.
18. A bolt or nut loosening monitoring system, characterized in that the loosening monitoring system comprises at least one bolt or nut loosening monitoring device according to any one of claims 1-8, the loosening monitoring system further comprising a signal analyzing device and a laser emitting device;
the signal analysis device and the laser emission device are respectively in communication connection with the optical fiber deformation sensor in the loosening monitoring device;
the laser emitting device is used for emitting laser to the optical fiber deformation sensor; the signal analysis device is used for receiving and analyzing the optical signal returned by the optical fiber deformation sensor and judging the bolt or nut which is loosened according to the analysis result.
19. A bolt or nut loosening monitoring system as claimed in claim 18,
a first corresponding relation between the serial number of the optical fiber deformation sensor and the serial number of the bolt or the nut and a second corresponding relation between the serial number of the optical fiber deformation sensor and a sensitive waveband are prestored in the signal analysis device;
the signal analysis device is used for analyzing the center wavelength of the optical signal returned by the optical fiber deformation sensor, determining the number of the optical fiber deformation sensor according to the center wavelength of the optical signal and the second corresponding relation, and determining the number of the bolt or the nut corresponding to the optical signal according to the number of the optical fiber deformation sensor and the first corresponding relation.
20. A bolt or nut loosening monitoring system as claimed in claim 19,
the signal analysis device is also used for calculating the loosening angle of the bolt or the nut which is loosened according to the analysis result;
the signal analysis device is also pre-stored with a third corresponding relation between the serial number of the optical fiber deformation sensor and the standard central wavelength of the sensitive waveband;
and the signal analysis device determines the standard central wavelength of the optical fiber deformation sensor according to the serial number of the optical fiber deformation sensor and the third corresponding relation, compares the central wavelength of the optical signal returned by the optical fiber deformation sensor with the standard central wavelength, and calculates the loosening angle generated by the bolt or the nut corresponding to the optical signal.
21. A bolt or nut loosening monitoring system as claimed in claim 20,
the loosening monitoring system also comprises an alarm device; the alarm device is in communication connection with the signal analysis device;
the alarm device is used for receiving data uploaded by the signal analysis device, the data comprise the serial number of the bolt or the nut and the loosening angle generated by the bolt or the nut, and when the loosening angle exceeds a threshold value, an alarm signal corresponding to the serial number of the bolt or the nut is generated.
22. A bolt or nut loosening monitoring system as claimed in claim 19 further including an alarm device; the alarm device is in communication connection with the signal analysis device;
and the alarm device is used for generating an alarm signal corresponding to the unreceived serial number of the bolt or the nut when the data uploaded by the signal analysis device is not received within a preset time period and the data comprises the serial number of the bolt or the nut.
23. Wind turbine tower comprising a wind turbine tower body, at least two bolts or nuts mounted on said wind turbine tower body, and a bolt or nut loosening monitoring device according to any of claims 1-8.
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| CN2019223362363 | 2019-12-20 | ||
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| CN202023085404.5U Active CN214537808U (en) | 2019-12-20 | 2020-12-18 | Bolt or nut looseness monitoring device and system, optical fiber deformation sensor and fan tower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441154A (en) * | 2022-01-11 | 2022-05-06 | 昆山市交通工程发展中心 | Bolt tightness monitoring device |
| CN114742820A (en) * | 2022-05-11 | 2022-07-12 | 西南交通大学 | Bolt looseness detection method and system based on deep learning and storage medium |
| CN115046494A (en) * | 2022-06-02 | 2022-09-13 | 重庆大学 | Thread structure looseness measuring device based on distributed shape sensing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008150B (en) * | 2019-12-20 | 2024-09-20 | 飞巽传感技术(上海)有限公司 | Looseness monitoring device and system for bolts or nuts |
-
2020
- 2020-12-18 CN CN202011511158.7A patent/CN113008151A/en active Pending
- 2020-12-18 CN CN202023085404.5U patent/CN214537808U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441154A (en) * | 2022-01-11 | 2022-05-06 | 昆山市交通工程发展中心 | Bolt tightness monitoring device |
| CN114742820A (en) * | 2022-05-11 | 2022-07-12 | 西南交通大学 | Bolt looseness detection method and system based on deep learning and storage medium |
| CN115046494A (en) * | 2022-06-02 | 2022-09-13 | 重庆大学 | Thread structure looseness measuring device based on distributed shape sensing |
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Effective date of registration: 20220630 Address after: 201306 C, 888, west two road, Nanhui new town, Pudong New Area, Shanghai Applicant after: Feixun sensor technology (Shanghai) Co.,Ltd. Address before: 201306 2nd floor, building 2, 4766 Jiangshan Road, Nicheng Town, Pudong New Area, Shanghai Applicant before: AULTON NEW ENERGY AUTOMOTIVE TECHNOLOGY Group Applicant before: Feixun sensor technology (Shanghai) Co.,Ltd. Applicant before: SHENZHEN YIXUN TECHNOLOGY Co.,Ltd. |