CN114061460B - Axial displacement monitoring device for gear box of main shaft built-in wind generating set - Google Patents
Axial displacement monitoring device for gear box of main shaft built-in wind generating set Download PDFInfo
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- CN114061460B CN114061460B CN202111371303.0A CN202111371303A CN114061460B CN 114061460 B CN114061460 B CN 114061460B CN 202111371303 A CN202111371303 A CN 202111371303A CN 114061460 B CN114061460 B CN 114061460B
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses an axial displacement monitoring device of a gear box of a wind generating set with a built-in main shaft, which belongs to the technical field of axial displacement monitoring and comprises a first assembly half ring, wherein a second assembly half ring is arranged above the first assembly half ring, and one end of the first assembly half ring and one end of the second assembly half ring are symmetrically connected with two connecting rotating shafts; compared with the prior art, the device integrates the detection and warning structure, the data transmission is rapid and accurate, the problem that the remote transmission data of the existing device has external interference is solved, the inner walls of the first assembly half ring and the second assembly half ring of the device are provided with the rubber gaskets, and meanwhile, the connecting springs are arranged in the mounting cylinder body, so that the rubber gaskets and the connecting springs can absorb vibration generated during the working of the gear box at the same time, the influence of the vibration generated during the working of the gear box on the laser ranging sensor is avoided, and the two are combined, so that the error of the measured data can be reduced, and the monitoring effect of the device is improved.
Description
Technical Field
The invention belongs to the technical field of axial displacement monitoring, and particularly relates to a device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft.
Background
Wind power generation refers to a device required by converting kinetic energy of wind into electric energy, called a wind generating set, and a gear box is an important mechanical component in the wind generating set, and the main function of the gear box is to transmit power generated by a wind wheel under the action of wind power to a generator and enable the generator to obtain corresponding rotating speed.
The gear box of the wind driven generator set is characterized in that the gear box can generate fatigue damage and even cracks when being used for a long time, if the maintenance is not performed in time, the main shaft is broken, the hub and the blades fall along with the broken main shaft, and huge losses are generated.
Disclosure of Invention
To solve the problems set forth in the background art. The invention provides a device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft, which has the characteristics of reducing errors of measured data and improving the monitoring effect of the device.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a built-in wind generating set gear box axial displacement monitoring devices of main shaft, includes first assembly semi-ring, the top of first assembly semi-ring is provided with the second assembly semi-ring, the one end of first assembly semi-ring and the one end symmetry of second assembly semi-ring are connected with two connection pivot, one side that first assembly semi-ring and second assembly semi-ring are close to the connection pivot and one side that first assembly semi-ring and second assembly semi-ring kept away from the connection pivot all are provided with the assembly groove, the internal thread connection of assembly groove has assembly bolts, the inner wall of first assembly semi-ring and second assembly semi-ring all is connected with rubber gasket, the position that corresponds corresponding assembly bolts on the rubber gasket all is provided with the through-hole on the corresponding rubber gasket, the equal symmetry of outer wall of first assembly semi-ring and second assembly semi-ring is connected with two installation barrel, four along circumference equidistant distribution between the installation barrel, the barrel bottom of installation barrel is provided with the cable connector perforation, the inside of installation barrel is provided with laser range sensor, range sensor and installation barrel fixed knot constructs and installs the outer wall connection of cable connector outside the miniature cable connector, the miniature cable connector is connected with the miniature cable connector through the fixed connection groove, the miniature cable connector is connected with the miniature cable connector.
In the invention, the fixing structure comprises a plurality of fixing plates distributed at equal intervals in the circumferential direction, the fixing plates are positioned in the installation cylinder body, the wall surface, close to the laser ranging sensor, of the fixing plates is contacted with the laser ranging sensor, and a plurality of connecting springs are connected between the fixing plates and the inner wall of the installation cylinder body.
In the invention, the micro control alarm comprises a shell, the shell is connected with the mounting groove through a screw, a processing module is assembled in the shell, an input port of the processing module is connected with a man-machine interaction module, an input port and an output port of the processing module are connected with a set data storage module, an input port of the processing module is connected with a receiving serial port module, a connecting port of the receiving serial port module is connected with a connecting cable, an output port of the processing module is respectively connected with an alarm module and a wireless receiving and transmitting module, and power ports of the receiving serial port module, the man-machine interaction module, the processing module, the set data storage module, the alarm module and the wireless receiving and transmitting module are all connected with a power module.
In the invention, the man-machine interaction module is a touch screen, and the warning module is an alarm.
In the invention, cable routing channels are arranged in the first assembly semi-ring and the second assembly semi-ring, cable penetrating openings are arranged at positions corresponding to connecting cables on the first assembly semi-ring and the second assembly semi-ring, the cable penetrating openings are communicated with the corresponding cable routing channels, and the connecting cables penetrate through the corresponding cable penetrating openings and enter the cable routing channels to be connected with a receiving serial port module of the micro control alarm.
In the invention, a top plate is arranged at one side of the inner part of the installation cylinder body, which is close to the bottom of the cylinder, a butt joint through hole is arranged at the position, corresponding to the perforation of the cable connector, of the top plate, the cable connector can pass through the butt joint through hole and the perforation of the cable connector and extend out of the installation cylinder body, a movable through groove is arranged on the side wall of the installation cylinder body, a movable rod is arranged in the movable through groove, one end, close to the top plate, of the movable rod is connected with the top plate, and the connecting section of the movable rod and the top plate is positioned at a gap position corresponding to the two fixed plates.
The invention further comprises a gear box shell, wherein the inside of the gear box shell is connected with a main shaft, one end of the main shaft, which is far away from the gear box shell, is connected with a main shaft end, the first assembly semi-ring and the second assembly semi-ring are assembled on the outer side of one end, which is close to the main shaft end, of the gear box shell through assembly bolts, and the detection ends of the four laser ranging sensors face to the main shaft end and are perpendicular to the main shaft end.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the distance between the four laser ranging sensors and the end face of the main shaft is detected, detected data is fed back to the micro-control alarm through the cable, the micro-control alarm compares the received ranging data with the set data and the initial distance data, and when the displacement of the detected data exceeds the threshold value of the set data, the control alarm module alarms, so that the monitoring function of axial displacement of the main shaft in the gear box of the main shaft built-in wind turbine generator system is realized.
2. The fixing mode has good fixing effect, and larger gaps are generated among the fixing plates due to the fact that the fixing plates enter the laser ranging sensor, the gaps can well help the laser ranging sensor to dissipate heat, and the service life of the laser ranging sensor is prolonged.
3. The cable connected with the cable connector of the laser ranging sensor enters the cable routing channel through the cable through hole and is connected with the receiving serial port module of the micro control alarm.
4. When the laser ranging sensor is required to be maintained or overhauled, the laser ranging sensor can be ejected out of the installation cylinder body only by disassembling the connected cable and pulling the movable rod to enable the movable rod to move in the movable through groove to drive the connected top plate to move in the installation cylinder body, so that the laser ranging sensor is maintained or overhauled conveniently and rapidly.
Drawings
FIG. 1 is a schematic view of the structure of the present invention in an assembled position;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a perspective view of another view of the present invention;
FIG. 4 is a cross-sectional view of the mounting cylinder of the present invention;
FIG. 5 is a schematic view of the construction of a first assembly half of the present invention;
FIG. 6 is a system diagram of a micro-control alarm of the present invention;
in the figure: 1. a gearbox housing; 2. a first assembly half ring; 3. a main shaft; 4. a spindle end; 5. the connecting rotating shaft; 6. a second assembly half ring; 7. a mounting groove; 8. a micro-control alarm; 81. receiving a serial port module; 82. a man-machine interaction module; 83. a processing module; 84. setting a data storage module; 85. a power module; 86. a warning module; 87. a wireless transceiver module; 9. an assembly groove; 10. assembling a bolt; 11. installing a cylinder; 12. a rubber gasket; 13. a connecting cable; 14. perforating a cable connector; 15. a cable connector; 16. a connecting spring; 17. a fixing plate; 18. a laser ranging sensor; 19. a top plate; 20. a moving rod; 21. moving the through groove; 22. a cable routing channel; 23. a cable penetrating opening; 24. and (5) butting the through holes.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-6, the present invention provides the following technical solutions: the utility model provides a main shaft embeds wind generating set gear box axial displacement monitoring devices, including first assembly semi-ring 2, the top of first assembly semi-ring 2 is provided with second assembly semi-ring 6, the one end of first assembly semi-ring 2 and the one end symmetry of second assembly semi-ring 6 are connected with two connection pivot 5, one side that first assembly semi-ring 2 and second assembly semi-ring 6 are close to connection pivot 5 and one side that first assembly semi-ring 2 and second assembly semi-ring 6 kept away from connection pivot 5 all are provided with assembly groove 9, the internal thread connection of assembly groove 9 has assembly bolt 10, the inner wall of first assembly semi-ring 2 and second assembly semi-ring 6 all is connected with rubber gasket 12, the position that corresponds corresponding assembly bolt 10 on the rubber gasket 12 all is provided with the through-hole, assembly bolt 10 extends the through-hole on the corresponding rubber gasket 12, the equal symmetry of outer wall of first assembly semi-ring 2 and second assembly semi-ring 6 is connected with two installation barrel 11, along circumference equidistant distribution between four installation barrel 11, the barrel bottom of installation barrel 11 is provided with cable connector perforation 14, the inside of installation barrel 11 is provided with laser range finding sensor 18 and the inner wall connection of installation barrel 11 is provided with cable connector 13, the laser range finding sensor 18 and the inner wall connection of cable connector 13 is provided with the laser range finding sensor 11, the end is connected with the end of cable connector 13 through the inner wall connection of the laser range finding sensor 11, the end is provided with the end connection of cable connector 15, the inner wall is connected with the end of the end is provided with the laser range finding sensor 11, and is connected with the end through-station connection of the laser cable connector 15.
Specifically, the fixing structure includes a plurality of fixing plates 17 distributed at equal intervals in the circumferential direction, the plurality of fixing plates 17 are located inside the installation cylinder 11 and are close to the wall surface of the laser ranging sensor 18 to be in contact with the laser ranging sensor 18, and a plurality of connecting springs 16 are connected between the plurality of fixing plates 17 and the inner wall of the installation cylinder 11.
Specifically, the micro-control alarm 8 includes a housing, the housing is connected with the mounting groove 7 through a screw, a processing module 83 is assembled in the housing, an input port of the processing module 83 is connected with a man-machine interaction module 82, an input port and an output port of the processing module 83 are connected with a set data storage module 84, an input port of the processing module 83 is connected with a receiving serial port module 81, a connection port of the receiving serial port module 81 is connected with the connection cable 13, an output port of the processing module 83 is respectively connected with an alarm module 86 and a wireless transceiver module 87, and power ports of the receiving serial port module 81, the man-machine interaction module 82, the processing module 83, the set data storage module 84, the alarm module 86 and the wireless transceiver module 87 are all connected with a power module 85.
Specifically, the man-machine interaction module 82 is a touch screen, and the warning module 86 is an alarm.
Specifically, still include gear box shell 1, the inside of gear box shell 1 is connected with main shaft 3, and the one end that main shaft 3 kept away from gear box shell 1 is connected with main shaft end 4, and first assembly semi-ring 2 and second assembly semi-ring 6 pass through assembly bolt 10 and assemble in the one end outside that gear box shell 1 is close to main shaft end 4, and the detection end of four laser range finding sensors 18 face main shaft end 4 and perpendicular with main shaft end 4.
The working principle of the embodiment is as follows:
before monitoring, placing four laser ranging sensors 18 into four installation cylinders 11 in sequence, limiting the four laser ranging sensors 18 by a plurality of fixing plates 17 which are connected by extrusion through a plurality of connecting springs 16 in the four installation cylinders 11, realizing the installation of the four laser ranging sensors 18, enabling cable connectors 15 on the four laser ranging sensors 18 to pass through cable connector through holes 14 on the corresponding installation cylinders 11 and extend out of the corresponding installation cylinders 11 respectively, connecting one ends of the four connecting cables 13 with the four cable connectors 15 respectively, connecting the other ends of the four connecting cables 13 with a receiving serial port module 81 of a miniature control alarm 8, installing a shell of the miniature control alarm 8 into an installation groove 7 of a second assembly half ring 6 through screws, enabling a first assembly half ring 2 and the second assembly half ring 6 to be opened through two connecting rotating shafts 5, sleeving the first assembly half ring 2 and the second assembly half ring 6 on the outer side of one end of a gear box shell 1 close to a main shaft end 4, adjusting the positions of the first assembly half ring 2 and the second assembly half ring 6, enabling the other ends of the four connecting cables 13 to face the four assembly half rings 2 and the fourth assembly half ring 6 on the main shaft shell 1 and the fourth assembly half ring 4 to face the main shaft end of the first assembly half ring 4 through the four connecting shafts 4;
before monitoring, the maximum displacement distance between the four laser ranging sensors 18 and the surface of the spindle head 4 is set through the man-machine interaction module 82 (the set data are summarized from a large amount of historical data without maintenance and requiring maintenance), the man-machine interaction module 82 feeds back the set data to the processing module 83, the processing module 83 feeds back the set data to the set data storage module 84, and the set data storage module 84 stores the set data;
before the gearbox is started, the four laser ranging sensors 18 detect the distance between the four laser ranging sensors and the surface of the spindle end 4, the detected data are fed back to the processing module 83 in real time through the connecting cable 13, the processing module 83 feeds back the data at the moment to the setting data storage module 84 as initial distance data, the setting data storage module 84 stores the initial distance data, in the starting process of the gearbox, the four laser ranging sensors 18 detect the distance between the four laser ranging sensors and the surface of the spindle end 4, the detected data are fed back to the processing module 83 in real time through the connecting cable 13, the processing module 83 extracts the setting data stored in the setting data storage module 84 and compares the initial distance data with real-time data, if the real-time data are not shifted or the shift distance is within the range of the setting data, the processing module 83 feeds back the real-time data to the computer through the wireless receiving and transmitting module 87 for storage, if the real-time data shift distance exceeds the range of the setting data, the processing module 83 sends a control command to the warning module 86 for warning, and the warning staff is reminded to carry out maintenance and the real-time data to be fed back to the computer through the wireless module 87 for storage;
detection principle of the laser ranging sensor 18:
the laser ranging sensor 18 emits laser through the laser source, detects the laser reflected back by the surface of the spindle end 4 through the light reflection detection port, and the distance L between the laser ranging sensor 18 and the surface of the spindle end 4 satisfies the following formula: l=ct/2, where t is the time difference from the emission of the laser light to the detection of the reflected laser light, and c is the propagation speed of the light in air.
Example 2
The difference between this embodiment and embodiment 1 is that:
specifically, the cable routing channels 22 are respectively provided in the first assembly semi-ring 2 and the second assembly semi-ring 6, the positions of the first assembly semi-ring 2 and the second assembly semi-ring 6 corresponding to the connecting cables 13 are respectively provided with a cable penetrating opening 23, the cable penetrating openings 23 are communicated with the corresponding cable routing channels 22, and the connecting cables 13 penetrate through the corresponding cable penetrating openings 23 to enter the cable routing channels 22 to be connected with the receiving serial port modules 81 of the micro-control alarm 8.
The working principle of the embodiment is as follows:
before monitoring, one end of each of the four connecting cables 13 is connected with the four cable connectors 15, the other ends of the four connecting cables 13 penetrate through the cable penetrating openings 23 at the nearest positions to extend into the cable routing channel 22 and extend out of the mounting groove 7, the other ends of the four connecting cables 13 are connected with the receiving serial port module 81 of the micro control alarm 8, the four connecting cables 13 are plugged into the cable routing channel 22 through the mounting groove 7, and the shell of the micro control alarm 8 is mounted in the mounting groove 7 of the second assembly semi-ring 6 through screws.
Example 3
This embodiment differs from embodiment 2 in that:
specifically, a top plate 19 is arranged on one side, close to the bottom of the barrel, of the inside of the installation barrel 11, a butt joint through hole 24 is formed in the top plate 19, corresponding to the cable connector through hole 14, the cable connector 15 can pass through the butt joint through hole 24 and the cable connector through hole 14 and extend out of the installation barrel 11, a movable through groove 21 is formed in the side wall of the installation barrel 11, a movable rod 20 is arranged in the movable through groove 21, one end, close to the top plate 19, of the movable rod 20 is connected with the top plate 19, and a connecting section of the movable rod 20 and the top plate 19 is located at a gap position corresponding to the two fixing plates 17.
The working principle of the embodiment is as follows:
when the four laser ranging sensors 18 and the micro control alarm 8 are required to be maintained or overhauled in long-term use, the connecting cables 13 connected to the four cable connectors 15 are disassembled, the four moving rods 20 move in the corresponding moving through grooves 21 towards the opening ends close to the four mounting cylinders 11, the four moving rods 20 drive the connected top plates 19 to move in the same direction, the four top plates 19 eject the corresponding laser ranging sensors 18 out of the mounting cylinders 11 in the moving process, at the moment, the laser ranging sensors 18 can be maintained or overhauled, screws on the shell of the micro control alarm 8 are disassembled, the micro control alarm 8 is taken out, and the connecting cables 13 connected to the receiving serial port modules 81 of the micro control alarm 8 are disassembled, so that the micro control alarm 8 can be maintained or overhauled, and the micro control alarm 8 is convenient and fast to use.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a built-in wind generating set gear box axial displacement monitoring devices of main shaft, includes first assembly semi-ring (2), its characterized in that: the utility model discloses a laser range finding device, including first assembly semi-ring (2), second assembly semi-ring (6) are provided with the top of first assembly semi-ring (2), one end of first assembly semi-ring (2) and one end symmetry of second assembly semi-ring (6) are connected with two connection pivot (5), one side that first assembly semi-ring (2) and second assembly semi-ring (6) are close to connection pivot (5) and one side that first assembly semi-ring (2) and second assembly semi-ring (6) kept away from connection pivot (5) all are provided with assembly groove (9), the internal thread connection of assembly groove (9) has assembly bolt (10), the inner wall of first assembly semi-ring (2) and second assembly semi-ring (6) all is connected with rubber gasket (12), the outer wall of first assembly semi-ring (2) and second assembly semi-ring (6) all symmetry is connected with two installation barrel (11), the barrel bottom of installation barrel (11) is provided with cable connector perforation (14), the inside of installation barrel (11) is provided with laser range finding sensor (18), laser range finding sensor (18) and installation barrel (11) are fixed in fixed connection barrel (18), the cable connector (15) passes through the cable connector perforation (14) and extends to the outside of the installation barrel (11) and is connected with connecting cable (13), the outer wall of second assembly semi-ring (6) is provided with mounting groove (7), the inside of mounting groove (7) has miniature control alarm (8) through screwed connection, the one end that cable connector (15) was kept away from to connecting cable (13) is connected with the port of miniature control alarm (8).
2. The device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft according to claim 1, wherein: the fixing structure comprises a plurality of fixing plates (17) which are distributed at equal intervals in the circumferential direction, the fixing plates (17) are located in the installation cylinder body (11) and are close to the wall surface of the laser ranging sensor (18) to be in contact with the laser ranging sensor (18), and a plurality of connecting springs (16) are connected between the fixing plates (17) and the inner wall of the installation cylinder body (11).
3. The device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft according to claim 1, wherein: the miniature control alarm (8) comprises a shell, the shell is connected with the mounting groove (7) through a screw, a processing module (83) is assembled in the shell, an input port of the processing module (83) is connected with a man-machine interaction module (82), an input port and an output port of the processing module (83) are connected with a data storage module (84), an input port of the processing module (83) is connected with a receiving serial port module (81), a connecting port of the receiving serial port module (81) is connected with a connecting cable (13), an output port of the processing module (83) is respectively connected with an alarm module (86) and a wireless transceiver module (87), and power ports of the receiving serial port module (81), the man-machine interaction module (82), the processing module (83), the data storage module (84), the alarm module (86) and the wireless transceiver module (87) are all connected with a power module (85).
4. A device for monitoring axial displacement of a gear box of a wind turbine generator system with a built-in main shaft according to claim 3, wherein: the man-machine interaction module (82) is a touch screen, and the warning module (86) is an alarm.
5. A device for monitoring axial displacement of a gear box of a wind turbine generator system with a built-in main shaft according to claim 3, wherein: the novel micro-control alarm comprises a first assembly semi-ring (2) and a second assembly semi-ring (6), wherein cable wiring channels (22) are formed in the first assembly semi-ring (2) and the second assembly semi-ring (6), cable penetrating openings (23) are formed in positions, corresponding to connecting cables (13), on the first assembly semi-ring (2) and the second assembly semi-ring (6), the cable penetrating openings (23) are communicated with the corresponding cable wiring channels (22), and the connecting cables (13) penetrate through the corresponding cable penetrating openings (23) to enter the cable wiring channels (22) to be connected with a receiving serial port module (81) of the micro-control alarm (8).
6. The device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft according to claim 2, wherein: the inside of installation barrel (11) is provided with roof (19) near one side of barrel bottom, the position that corresponds cable connector perforation (14) on roof (19) is provided with butt joint through-hole (24), cable connector (15) accessible butt joint through-hole (24) and cable connector perforation (14) and extend to outside installation barrel (11), the lateral wall of installation barrel (11) is provided with removal logical groove (21), the inside of removal logical groove (21) is provided with movable rod (20), the one end that movable rod (20) is close to roof (19) is connected with roof (19), the linkage segment of movable rod (20) and roof (19) is located the space position that corresponds two fixed plates (17).
7. The device for monitoring axial displacement of a gear box of a wind generating set with a built-in main shaft according to claim 1, wherein: still include gear box shell (1), the internal connection of gear box shell (1) has main shaft (3), the one end that gear box shell (1) was kept away from to main shaft (3) is connected with main shaft end (4), and first assembly semi-ring (2) and second assembly semi-ring (6) pass through assembly bolt (10) to be assembled in the one end outside that gear box shell (1) is close to main shaft end (4), and the detection end of four laser range finding sensors (18) face main shaft end (4) and are perpendicular with main shaft end (4).
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| CN202111371303.0A CN114061460B (en) | 2021-11-18 | 2021-11-18 | Axial displacement monitoring device for gear box of main shaft built-in wind generating set |
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