CN112648151A - Method for monitoring fracture of blade root bolt of wind generating set - Google Patents
Method for monitoring fracture of blade root bolt of wind generating set Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a method for monitoring fracture of a blade root bolt of a wind generating set, which is characterized in that a high-precision distance measuring sensor is arranged on a hub web plate, the distances between the end part of the blade root bolt, a nut and a blade root flange and the high-precision distance measuring sensor are monitored in real time, a collecting instrument collects the distance values monitored by the high-precision distance measuring sensor in real time, a fan master control reads the distance values collected by the collecting instrument in real time and uploads the distance values to a wind field central control server, and the wind field central control server judges the condition of the blade root bolt according to the distance values monitored by the high-precision. According to the method for monitoring the fracture of the blade root bolt of the wind generating set, provided by the invention, whether the blade root bolt is fractured or seriously loosened is judged by monitoring the distances between the end part of the blade root bolt of the wind generating set, the nut and the flange and the distance measuring sensor probe respectively, the condition that the blade root bolt is fractured or seriously loosened can be comprehensively monitored, fault alarm is realized, and the method has the characteristics of simple process, low cost, high precision and high reliability.
Description
Technical Field
The invention relates to a method for monitoring fracture of a blade root bolt of a wind generating set, and belongs to the technical field of monitoring of flange connecting bolts of wind generating sets.
Background
At present, the connection between the blade root and the hub is generally realized through a pre-embedded blade root high-strength bolt. The bolts in the flange connecting structure bear the tension and compression circulation action under the alternating load action. Under the alternating load effect of pulling and pressing, the screw thread generates plastic deformation to cause bolt fracture or serious looseness, thereby influencing the normal operation of a unit, even causing accidents of blade falling, tower barrel collapse and the like in serious conditions, and bringing great economic loss to wind power enterprises.
The existing wind generating set blade root bolt fracture judgment mainly adopts the following modes:
the first technical scheme is as follows: adopt proximity sensor, sensor probe point to bolt, and parallel with the flange face, when the bolt fracture drops, proximity sensor detectable appears the vacancy in former bolt installation department, judges that bolt fracture problem appears. However, when the bolt is broken or loosened seriously but not completely falls off, the proximity sensor cannot detect abnormal conditions, and the hidden trouble of missing report exists.
The second prior art scheme is: all the bolts on the flange are connected by adopting the steel wire rope and the clamp spring, when the bolt is broken, the steel wire rope is broken under the action of the gravity of the bolt, and a sensor connected with the steel wire rope sends an alarm signal. However, according to the technical scheme, the clamp spring needs to be installed on each bolt, the process is complex, the construction time is high in cost, the fracture resistance of the steel wire rope is difficult to control, the bolts are likely to be fractured, the steel wire rope is not fractured, the alarm cannot be given, and the monitoring is inaccurate.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for monitoring the fracture of the blade root bolt of the wind generating set, which judges whether the blade root bolt is fractured or seriously loosened by monitoring the distances between the end part of the blade root bolt of the wind generating set, a nut and a flange and a distance measuring sensor probe respectively, can comprehensively monitor the condition of the fracture or serious loosening of the blade root bolt, realizes fault alarm and has the characteristics of simple process, low cost, high precision and high reliability.
The technical scheme adopted by the invention for solving the technical problem is as follows: the provided method for monitoring the fracture of the blade root bolt of the wind generating set comprises the following steps:
(1) installing a group of high-precision distance measuring sensors on a hub web plate, wherein the number of the high-precision distance measuring sensors is at least 4, the installation positions of the high-precision distance measuring sensors are arranged on a plane parallel to a blade root flange, the high-precision distance measuring sensors are circumferentially and uniformly distributed by taking the center of a circle of the hub web plate as the center of a circle, a connecting line of the center of the circle where the installation positions of the high-precision distance measuring sensors are arranged and the center of the circle where the installation positions of connecting bolts of the blade root flange are arranged is perpendicular to the plane of the blade root flange, and a probe of the high-precision distance measuring sensors points to the end surface of a blade;
(2) the following reference values of the blade root bolt under the normal condition are obtained through measurement:
setting the number of the blade root bolts arranged on the blade root flange to be N, wherein in the blade changing process, the blade root bolts rotate along with the blade root flange, and the distance between the end part of each blade root bolt and the high-precision distance measuring sensor, namely the distance is recorded as a first standard distance value L1 when the blade root flange rotates for 360 degrees/N;
the distance between the surface of the nut for fixing the blade root bolt and the high-precision distance measuring sensor is recorded as a second standard distance value L2;
the distance between the surface of the blade root flange and the high-precision distance measuring sensor is recorded as a third standard distance value L3;
in the process of changing the pitch angle by 360 degrees/N, the high-precision distance measuring sensor scans the pitch angle corresponding to the bolt, which is marked as a first standard pitch angle beta 1,
wherein R1 denotes a radius of a root bolt, R0 denotes a radius of a circle where the root bolt is installed, and Δ β 1 denotes an angular deviation value due to the manufacture and installation of the root bolt;
the pitch angle corresponding to the process of scanning half of the nut by the high-precision distance measuring sensor is recorded as a second standard pitch angle beta 2,
wherein S1 represents the nut opposing face distance, Δ β 2 represents the nut manufacturing installation and the angular offset due to the hexagonal shape of the nut and E1 > S1, E1 represents the screwA parent diagonal edge distance;
the pitch angle corresponding to the process of scanning the surface of the blade root flange is recorded as a third standard pitch angle beta 3,
wherein D1 represents a straight line distance between the nearest two points of adjacent nuts on a circle on which the root bolt is installed, and Δ β 3 represents an angular deviation value in consideration of the manufacturing installation of the nuts and due to the hexagonal shape of the nuts and E1 > S1;
(3) the acquisition instrument acquires the distance between the end part of the blade root bolt and the high-precision distance measuring sensor, which is monitored by the high-precision distance measuring sensor in real time, and records the distance as a first measured distance value L1 ', the distance between the surface of the nut and the high-precision distance measuring sensor, as a second measured distance value L2 ', and the distance between the surface of the blade root flange and the high-precision distance measuring sensor, as a third measured distance value L3 '; the fan master control reads the distance value acquired by the acquisition instrument in real time and uploads the distance value to the wind field central control server;
(4) and the wind field central control server judges the condition of the bolt at the blade root according to the distance value monitored by the high-precision distance measuring sensor.
In the angular deviation value delta beta 2 in the step (2), the angular deviation value range caused by the hexagonal nut and the E1 being more than S1 is
In the angular deviation value delta beta 3 in the step (2), the angular deviation value range caused by the hexagonal nut and the E1 being more than S1 is
Step (4) the wind field central control server judges the condition of the blade root bolt according to the distance value monitored by the high-precision distance measuring sensor, and the method specifically comprises the following conditions:
a. if the high-precision distance measuring sensor periodically and sequentially detects a first measured distance value L1 ', a second measured distance value L2 ' and a third measured distance value L3 ' in the pitching process, and L1 ' is L1, L2 ' is L2, and L3 ' is L3, wherein the corresponding pitching angle when the first measured distance value L1 ' is detected is a first standard pitching angle beta 1, the corresponding pitching angle when the second measured distance value L2 ' is detected is a second standard pitching angle beta 2, and the corresponding pitching angle when the third measured distance value L3 ' is detected is a third standard pitching angle beta 3, the blade root bolt state is normal;
b. if a first measured distance value L1 ' is detected within the range of the first standard pitch angle beta 1 in the pitch changing process, and L1 ' < L1, and the deviation between the first measured distance value L1 ' and the first standard distance value L1 exceeds a first preset value delta L1, it is indicated that the current blade root bolt has the problem of breakage or serious looseness, but does not fall off;
c. if a second measured distance value L2 ' is detected within the range of the second standard pitch angle beta 2 in the pitch changing process, and L2 ' < L2, and the deviation between the second measured distance value L2 ' and the second standard distance value L2 exceeds a second preset value delta L2, it is indicated that the current blade root bolt has the problem of breakage or serious loosening, but does not fall off;
d. if a first measured distance value L1 ', L1 ' > L3 is detected in the range of the first standard pitch angle beta 1 in the pitch changing process, and the deviation between the first measured distance value L1 ' and the third standard distance value L3 exceeds a third preset value delta L3, it is indicated that the current blade root bolt is broken and falls off;
e. if a second measured distance value L2 'is detected within the range of the second standard pitch angle beta 2 during the pitching process, and L2' ≧ L3, the nut is indicated to be fallen off currently.
And the fan master control stores the distance value and the judgment result data which are read in real time, and generates a monitoring report according to the judgment result to display and alarm.
The high-precision distance measuring sensor is arranged on the web plate of the hub through the fixing support.
The fixed bolster adopts the Z support that appears, the Z support that appears is dull and stereotyped by first step, the dull and stereotyped vertical connecting plate of second step and connection first step is dull and stereotyped and the dull and stereotyped constitutes with the second step, the dull and stereotyped sensor mounting hole that is equipped with of first step, high accuracy distance measuring sensor passes through nut fixed mounting in the sensor mounting hole, the dull and stereotyped a set of web connecting hole that is equipped with of second step, the wheel hub web is seted up the support mounting hole that corresponds with web connecting hole position and is reserved the monitoring hole that corresponds with high accuracy distance measuring sensor position, the Z support is fixed in the wheel hub web through the bolt of installing in web connecting hole and support mounting hole in proper order, high accuracy distance measuring sensor.
The invention has the beneficial effects based on the technical scheme that:
according to the method for monitoring the fracture of the blade root bolt of the wind generating set, provided by the invention, the blade root bolt is fixed on the flange through the nut, the position of the blade root bolt on the flange is not available, and the high-precision distance measuring sensor detects the distance between the surface of the flange and the probe of the high-precision distance measuring sensor; when the blade root bolt is not loosened, the high-precision distance measuring sensor detects the normal distance between the end part of the blade root bolt, the surface of the nut and the probe at the installation position of the blade root bolt; when the blade root bolt breaks and extends out but does not fall off or extends out due to serious looseness, the distance between the high-precision distance measuring sensor probe and the end part of the blade root bolt and the surface of the nut can be obviously shortened; after the blade root bolt breaks and drops, the distance between high accuracy range sensor probe and the original blade root bolt mounting point can obviously increase. By utilizing the principle, the state of the blade root bolt is judged by monitoring the distances between the blade root bolt, the nut and the flange of the wind generating set and the distance measuring sensor probe respectively.
The invention can accurately judge three connection states of the leaf root bolt: (1) the bolt connection of the blade root is normal; (2) the blade root bolt has the problems of fracture or serious looseness, but does not fall off; (3) the blade root bolt has broken and fallen off. The invention can monitor the condition of fracture or serious looseness of the bolt of the blade root in real time, realize fault alarm and has the characteristics of simple process, low cost, high precision and high reliability. The distance between each sensor probe and a circle where the installation position of the blade root flange connecting bolt is located is collected in real time by a collecting instrument, sensor data collected by the collecting instrument is read through a fan main control unit, data collection of state monitoring of three blade root flange connecting bolts of the whole wind turbine generator is achieved, the fan main control unit uploads the data to a wind field central control server, and the purposes of data storage, analysis, alarming, displaying and monitoring report generation are achieved. The invention can realize comprehensive and omnibearing online monitoring on whether the flange connecting bolts of three blade roots of the hub of the whole unit are broken or seriously loosened, and can implement a safety control strategy for the unit exceeding a set threshold value, thereby ensuring the safe and reliable operation of the wind generating set.
Drawings
FIG. 1 is a schematic view of a high precision distance measuring sensor and a fixed mount;
FIG. 2 is a side view of a high precision ranging sensor and mounting location;
FIG. 3 is a top view of a high precision distance measuring sensor and mounting location;
FIG. 4 is a schematic view of a high-precision distance measuring sensor installed on the back of a hub web;
FIG. 5 is a schematic view of a hub web monitoring hole;
fig. 6 is a graph showing three distance values measured when no bolt is broken or severely loosened.
Fig. 7 is a schematic top view of the nut.
Fig. 8 is a side view of the nut.
Fig. 9 is a schematic diagram showing a distance change relationship with a change in the pitch angle, which is output when the bolt state is normal.
In the figure: 1-high-precision distance measuring sensor, 2-fixed support, 3-bolt, 4-blade root bolt, 5-wheel hub, 6-blade root slewing bearing, 7-blade root main body, 8-wheel hub web plate and 9-blade root flange.
Detailed Description
The invention is further illustrated by the following figures and examples.
The invention provides a method for monitoring fracture of a blade root bolt of a wind generating set, which comprises the following steps of with reference to fig. 1 to 9:
(1) the blade root of the wind turbine generator comprises a blade root main body 7, a blade root slewing bearing 6 and a hub 5, a hub web 8 is arranged in the hub, a group of high-precision distance measuring sensors 1 are mounted on the hub web, the number of the high-precision distance measuring sensors is n, the high-precision distance measuring sensors are circumferentially and uniformly distributed by taking the circle center of the hub web as the circle center, and probes of the high-precision distance measuring sensors point to the end face of a blade root bolt 4;
(2) the following reference values of the blade root bolt under the normal condition are obtained through measurement:
setting the number of the blade root bolts installed on the blade root flange 9 as N, wherein in the pitch changing process, the blade root bolts rotate along with the blade root flange, and the distance between the end part of each blade root bolt and the high-precision distance measuring sensor, namely the distance between the end part of each blade root bolt and the high-precision distance measuring sensor, is recorded as a first standard distance value L1 every time the blade root flange rotates for 360 degrees/N;
the distance between the surface of the nut for fixing the blade root bolt and the high-precision distance measuring sensor is recorded as a second standard distance value L2;
the distance between the surface of the blade root flange and the high-precision distance measuring sensor is recorded as a third standard distance value L3;
in the process of changing the pitch angle by 360 degrees/N, the high-precision distance measuring sensor scans the pitch angle corresponding to the bolt, which is marked as a first standard pitch angle beta 1,
wherein R1 denotes a radius of a root bolt, R0 denotes a radius of a circle where the root bolt is installed, and Δ β 1 denotes an angular deviation value due to the manufacture and installation of the root bolt;
the pitch angle corresponding to the process of scanning half of the nut by the high-precision distance measuring sensor is recorded as a second standard pitch angle beta 2,
wherein S1 represents the nut facing distance, Δ β 2 represents the nut manufacturing installation and the angular offset due to the hexagonal shape of the nut E1 > S1, the angular offset due to the hexagonal shape of the nut E1 > S1 ranges from
E1 denotes the nut diagonal distance;
scanning leafThe pitch angle corresponding to the root flange surface process-marked as the third standard pitch angle beta 3,
wherein D1 represents a straight line distance between the nearest two points of the adjacent nuts on the circle where the root bolts are installed, Δ β 3 represents an angular deviation value caused by hexagonal nut and E1 > S1 in consideration of the manufacturing installation of the nuts and the angular deviation value caused by hexagonal nut and E1 > S1
(3) The acquisition instrument acquires the distance between the end part of the blade root bolt and the high-precision distance measuring sensor, which is monitored by the high-precision distance measuring sensor in real time, and records the distance as a first measured distance value L1 ', the distance between the surface of the nut and the high-precision distance measuring sensor, as a second measured distance value L2 ', and the distance between the surface of the blade root flange and the high-precision distance measuring sensor, as a third measured distance value L3 '; the fan master control reads the distance value acquired by the acquisition instrument in real time and uploads the distance value to the wind field central control server;
(4) the wind field central control server judges the condition of the bolt at the blade root according to the distance value monitored by the high-precision distance measuring sensor:
a. if the high-precision distance measuring sensor periodically and sequentially detects a first measured distance value L1 ', a second measured distance value L2 ' and a third measured distance value L3 ' in the pitching process, and L1 ' is L1, L2 ' is L2, and L3 ' is L3, wherein the corresponding pitching angle when the first measured distance value L1 ' is detected is a first standard pitching angle beta 1, the corresponding pitching angle when the second measured distance value L2 ' is detected is a second standard pitching angle beta 2, and the corresponding pitching angle when the third measured distance value L3 ' is detected is a third standard pitching angle beta 3, the blade root bolt state is normal;
b. if a first measured distance value L1 ' is detected within the range of the first standard pitch angle beta 1 in the pitch changing process, and L1 ' < L1, and the deviation between the first measured distance value L1 ' and the first standard distance value L1 exceeds a first preset value delta L1, it is indicated that the current blade root bolt has the problem of breakage or serious looseness, but does not fall off;
c. if a second measured distance value L2 ' is detected within the range of the second standard pitch angle beta 2 in the pitch changing process, and L2 ' < L2, and the deviation between the second measured distance value L2 ' and the second standard distance value L2 exceeds a second preset value delta L2, it is indicated that the current blade root bolt has the problem of breakage or serious loosening, but does not fall off;
d. if a first measured distance value L1 ', L1 ' > L3 is detected in the range of the first standard pitch angle beta 1 in the pitch changing process, and the deviation between the first measured distance value L1 ' and the third standard distance value L3 exceeds a third preset value delta L3, it is indicated that the current blade root bolt is broken and falls off;
e. if a second measured distance value L2 'is detected within the range of the second standard pitch angle beta 2 during the pitching process, and L2' ≧ L3, the nut is indicated to be fallen off currently.
The first preset value delta L1, the second preset value delta L2 and the third preset value delta L3 can be set according to specific conditions such as bolt size, installation reserved length and flange surface precision.
The blade pitch angle is typically a little more than 90 °, i.e. the maximum rotation angle is a little more than 90 °, so at least 4 sensors are used in this embodiment. In this embodiment, n is 4, if become the oar angle and change 360 °/n, then the monitoring of 1/n circle blade root bolt is accomplished to a set of high accuracy range sensor, when becoming the oar angle and not being less than 90, only needs 4 sensors can accomplish the monitoring to a round bolt.
And the fan master control stores the distance value and the judgment result data which are read in real time, and generates a monitoring report according to the judgment result to display and alarm.
High accuracy range sensor passes through fixed bolster 2 to be installed in the wheel hub web.
The fixed bolster adopts the Z support that appears, the Z support is dull and stereotyped by first step, the dull and stereotyped and the dull and stereotyped vertical connecting plate of connection first step is constituteed with the dull and stereotyped second step of second step, the dull and stereotyped sensor mounting hole that is equipped with of first step, high accuracy distance measuring sensor passes through nut fixed mounting in the sensor mounting hole, the dull and stereotyped a set of web connecting hole that is equipped with of second step, the wheel hub web is seted up the support mounting hole that corresponds with web connecting hole position and is reserved the monitoring hole that corresponds with high accuracy distance measuring sensor position, the Z support is fixed in the wheel hub web through installing in proper order in the bolt 3 of web connecting hole and support mounting hole, high accuracy distance measuring sensor's.
The application provides a wind generating set blade root bolt fracture monitoring method still can alternate the bolt detection work who is applied to other rotary parts, for example be applied to wind generating set main shaft bolt fracture detection, only need a high accuracy range finding sensor can accomplish. Because the bolt head of main shaft is located the organism outside, does not set up the nut, can set up to 0 to nut relevant parameter default to realize the main shaft bolt fracture monitoring.
According to the method for monitoring the fracture of the blade root bolt of the wind generating set, provided by the invention, whether the blade root bolt is fractured or seriously loosened is judged by monitoring the distances between the blade root bolt, the nut and the flange of the wind generating set and the distance measuring sensor probe respectively, the condition that the blade root bolt is fractured or seriously loosened can be comprehensively monitored, fault alarm is realized, and the method has the characteristics of simple process, low cost, high precision and high reliability.
Claims (7)
1. A method for monitoring fracture of a blade root bolt of a wind generating set is characterized by comprising the following steps:
(1) installing a group of high-precision distance measuring sensors on a hub web plate, wherein the number of the high-precision distance measuring sensors is at least 4, the installation positions of the high-precision distance measuring sensors are arranged on a plane parallel to a blade root flange, the high-precision distance measuring sensors are circumferentially and uniformly distributed by taking the center of a circle of the hub web plate as the center of a circle, a connecting line of the center of the circle where the installation positions of the high-precision distance measuring sensors are arranged and the center of the circle where the installation positions of connecting bolts of the blade root flange are arranged is perpendicular to the plane of the blade root flange, and a probe of the high-precision distance measuring sensors points to the end surface of a blade;
(2) the following reference values of the blade root bolt under the normal condition are obtained through measurement:
setting the number of the blade root bolts arranged on the blade root flange to be N, wherein in the blade changing process, the blade root bolts rotate along with the blade root flange, and the distance between the end part of each blade root bolt and the high-precision distance measuring sensor, namely the distance is recorded as a first standard distance value L1 when the blade root flange rotates for 360 degrees/N;
the distance between the surface of the nut for fixing the blade root bolt and the high-precision distance measuring sensor is recorded as a second standard distance value L2;
the distance between the surface of the blade root flange and the high-precision distance measuring sensor is recorded as a third standard distance value L3;
in the process of changing the pitch angle by 360 degrees/N, the high-precision distance measuring sensor scans the pitch angle corresponding to the bolt, which is marked as a first standard pitch angle beta 1,
wherein R1 denotes a radius of a root bolt, R0 denotes a radius of a circle where the root bolt is installed, and Δ β 1 denotes an angular deviation value due to the manufacture and installation of the root bolt;
the pitch angle corresponding to the process of scanning half of the nut by the high-precision distance measuring sensor is recorded as a second standard pitch angle beta 2,
wherein S1 represents the nut opposing face distance, Δ β 2 represents the nut manufacturing installation and the angular offset due to the nut being hexagonal and E1 > S1, E1 represents the nut diagonal distance;
the pitch angle corresponding to the process of scanning the surface of the blade root flange is recorded as a third standard pitch angle beta 3,
wherein D1 represents a straight line distance between the nearest two points of adjacent nuts on a circle on which the root bolt is installed, and Δ β 3 represents an angular deviation value in consideration of the manufacturing installation of the nuts and due to the hexagonal shape of the nuts and E1 > S1;
(3) the acquisition instrument acquires the distance between the end part of the blade root bolt and the high-precision distance measuring sensor, which is monitored by the high-precision distance measuring sensor in real time, and records the distance as a first measured distance value L1 ', the distance between the surface of the nut and the high-precision distance measuring sensor, as a second measured distance value L2 ', and the distance between the surface of the blade root flange and the high-precision distance measuring sensor, as a third measured distance value L3 '; the fan master control reads the distance value acquired by the acquisition instrument in real time and uploads the distance value to the wind field central control server;
(4) and the wind field central control server judges the condition of the bolt at the blade root according to the distance value monitored by the high-precision distance measuring sensor.
2. The wind generating set root bolt fracture monitoring method according to claim 1, characterized in that: in the angular deviation value delta beta 2 in the step (2), the angular deviation value range caused by the hexagonal nut and the E1 being more than S1 is
3. The wind generating set root bolt fracture monitoring method according to claim 1, characterized in that: in the angular deviation value delta beta 3 in the step (2), the angular deviation value range caused by the hexagonal nut and the E1 being more than S1 is
4. The wind generating set root bolt fracture monitoring method according to claim 1, characterized in that: the wind field central control server judges the condition of the blade root bolt according to the distance value monitored by the high-precision distance measuring sensor, and the method specifically comprises the following steps:
a. if the high-precision distance measuring sensor periodically and sequentially detects a first measured distance value L1 ', a second measured distance value L2 ' and a third measured distance value L3 ' in the pitching process, and L1 ' is L1, L2 ' is L2, and L3 ' is L3, wherein the corresponding pitching angle when the first measured distance value L1 ' is detected is a first standard pitching angle beta 1, the corresponding pitching angle when the second measured distance value L2 ' is detected is a second standard pitching angle beta 2, and the corresponding pitching angle when the third measured distance value L3 ' is detected is a third standard pitching angle beta 3, the blade root bolt state is normal;
b. if a first measured distance value L1 ' is detected within the range of the first standard pitch angle beta 1 in the pitch changing process, and L1 ' < L1, and the deviation between the first measured distance value L1 ' and the first standard distance value L1 exceeds a first preset value delta L1, it is indicated that the current blade root bolt has the problem of breakage or serious looseness, but does not fall off;
c. if a second measured distance value L2 ' is detected within the range of the second standard pitch angle beta 2 in the pitch changing process, and L2 ' < L2, and the deviation between the second measured distance value L2 ' and the second standard distance value L2 exceeds a second preset value delta L2, it is indicated that the current blade root bolt has the problem of breakage or serious loosening, but does not fall off;
d. if a first measured distance value L1 ', L1 ' > L3 is detected in the range of the first standard pitch angle beta 1 in the pitch changing process, and the deviation between the first measured distance value L1 ' and the third standard distance value L3 exceeds a third preset value delta L3, it is indicated that the current blade root bolt is broken and falls off;
e. if a second measured distance value L2 'is detected within the range of the second standard pitch angle beta 2 during the pitching process, and L2' ≧ L3, the nut is indicated to be fallen off currently.
5. The wind generating set root bolt fracture monitoring method according to claim 1, characterized in that: and the fan master control stores the distance value and the judgment result data which are read in real time, and generates a monitoring report according to the judgment result to display and alarm.
6. The wind generating set root bolt fracture monitoring method according to claim 1, characterized in that: the high-precision distance measuring sensor is arranged on the web plate of the hub through the fixing support.
7. The wind generating set root bolt fracture monitoring method of claim 6, characterized in that: the fixed bolster adopts the Z support that appears, the Z support that appears is dull and stereotyped by first step, the dull and stereotyped vertical connecting plate of second step and connection first step is dull and stereotyped and the dull and stereotyped constitutes with the second step, the dull and stereotyped sensor mounting hole that is equipped with of first step, high accuracy distance measuring sensor passes through nut fixed mounting in the sensor mounting hole, the dull and stereotyped a set of web connecting hole that is equipped with of second step, the wheel hub web is seted up the support mounting hole that corresponds with web connecting hole position and is reserved the monitoring hole that corresponds with high accuracy distance measuring sensor position, the Z support is fixed in the wheel hub web through the bolt of installing in web connecting hole and support mounting hole in proper order, high accuracy distance measuring sensor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116591907A (en) * | 2023-04-06 | 2023-08-15 | 中广核新能源安徽有限公司 | Wind driven generator variable pitch bearing and connecting bolt state monitoring method and system |
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| CN116591907B (en) * | 2023-04-06 | 2024-05-14 | 中广核新能源安徽有限公司 | Wind driven generator variable pitch bearing and connecting bolt state monitoring method and system |
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Application publication date: 20210413 |