Fault diagnosis device for gearbox of wind driven generator

Abstract

The invention relates to the technical field of fault diagnosis, in particular to a wind driven generator gearbox fault diagnosis device which comprises a diagnosis box, a positioning mechanism and a detection mechanism, a mounting groove is formed in the side wall of the diagnosis box, and the positioning mechanism comprises a positioning plate, a first lead screw and an adjusting block; lifting grooves are formed in the side walls of the two sides of the mounting groove, the double-shaft motor is arranged in the lifting grooves, the two ends of the double-shaft motor are connected with first lead screws, and the first lead screws are rotationally arranged in the lifting grooves; the positioning plate is of a V-shaped structure, wing plates are arranged on the two sides of the positioning plate, and adjusting blocks are arranged on the wing plates. Sliding blocks are arranged on the first lead screws at the two ends, the adjusting blocks are in elastic sliding fit with the sliding blocks, and the two positioning plates are symmetrically arranged to position an output shaft of the gearbox; the detection mechanism is connected with the positioning plate and used for detecting the vibration frequency of the gearbox output shaft. According to the invention, positioning diagnosis can be carried out on output shafts with different sizes, and meanwhile, diagnosis can be carried out on gearboxes with different models and different output shaft heights, so that the application range of equipment is widened.

Description

Technical Field

[0001] The invention relates to the technical field of fault diagnosis, in particular to a wind turbine gearbox fault diagnosis device. Background Art

[0002] In wind turbines, the gearbox is responsible for converting the low-speed rotation of the wind rotor into efficient operation of the generator. However, since wind farms are usually located in remote areas and the operating environment is often accompanied by vibration and shock, this poses a severe test for the stability and reliability of the gearbox. It is necessary to diagnose and test the internal parts of the gearbox in a timely manner to ensure the normal operation of the wind turbine.

[0003] Traditional wind turbine gearbox fault diagnosis methods mainly rely on manual inspections and regular maintenance, which is not only inefficient but also difficult to detect early faults. With the development of sensor technology and signal processing technology, fault diagnosis methods based on vibration monitoring have gradually become mainstream.

[0004] However, when using existing vibration monitoring equipment for wind turbine gearboxes of different models and sizes, due to the large differences in the height and size of their output shafts, there are often problems such as inaccurate positioning and large detection errors, which affects the diagnosis results and efficiency. Summary of the invention

[0005] The purpose of the present application is to provide a wind turbine gearbox fault diagnosis device, which drives the second screw to rotate through a dual-axis motor, driving the sliders at both ends to slide respectively, and at the same time, the elastic sliding cooperation of the slider and the adjustment block can synchronously drive the positioning plates at both ends to approach each other, so as to position the output shaft of the gearbox extended into the installation groove. The V-shaped design of the positioning plate can position output shafts of different sizes. At the same time, the dual-axis motors can control the positioning plates at both ends respectively, so as to perform positioning diagnosis on gearboxes of different models and with inconsistent output shaft heights, thereby improving the diagnostic efficiency and diagnostic results.

[0006] To achieve the above-mentioned purpose, the present application provides a wind turbine gearbox fault diagnosis device, including a diagnosis box, a positioning mechanism and a detection mechanism, the side wall of the diagnosis box is provided with a mounting groove, and the positioning mechanism is arranged in the mounting groove; the positioning mechanism includes a positioning plate, a dual-axis motor, a first screw and an adjustment block; the side walls on both sides of the mounting groove are provided with lifting grooves, the dual-axis motor is arranged in the lifting groove, and the first screw is connected to both ends of the dual-axis motor, and the first screw is rotatably arranged in the lifting groove; the positioning plate is a V-shaped structure, and wing plates are provided on both sides of the positioning plate, and the adjustment blocks are provided on the wing plates on both sides; sliders are provided on the first screws at both ends, and the adjustment block is elastically slidably matched with the slider, and the two positioning plates located on the first screw are symmetrically arranged, and the output shaft of the gear box is arranged between the positioning plates; the detection mechanism is arranged at the top and bottom of the mounting groove, and is respectively connected to the positioning plates, and is used to detect the frequency of vibration of the output shaft of the gear box.

[0007] As a further solution of the present invention: the detection mechanism includes a first sensor and a first spring, detection grooves are arranged at the top and bottom of the installation groove, the first sensor is fixedly arranged inside the detection groove, and the positioning plates on both sides are respectively provided with contact blocks facing one side of the top and bottom of the installation groove, the contact blocks extend into the detection groove, and the first spring is arranged between the top of the contact block and the first sensor.

[0008] As a further solution of the present invention: the side wall of the slider is provided with a sensing groove, the side wall of the adjustment block is provided with a sensing plate, the sensing plate is slidably arranged in the sensing groove, a second sensor is arranged in the sensing groove, and a second spring is arranged between the second sensor and the sensing block.

[0009] As a further solution of the present invention: a support mechanism is provided on one side of the diagnostic box, and the support mechanism includes a support plate, a stepper motor and a limit plate. A limit slot is provided on the support plate, and a second screw rod is provided in the limit slot. The stepper motor is provided on the side wall of the support plate, and its output end is connected to the second screw rod. An intermediate ring is provided at the middle position of the second screw rod, and the screw teeth on both sides of the intermediate ring are in opposite directions. The limit plates are provided on both sides of the intermediate ring, and the bottom of the limit plate is provided on the second screw rod, and the top of the limit plate limits the two sides of the gear box.

[0010] As a further solution of the present invention: a rounded corner is provided on one side of the positioning plate facing outside the mounting groove.

[0011] As a further solution of the present invention: the size of the contact block is adapted to the detection slot.

[0012] As a further solution of the present invention: the size of the induction plate is adapted to the induction slot.

[0013] As a further solution of the present invention: a display panel is arranged on the side wall of the diagnosis box, and a plurality of control buttons are arranged on the right side of the display panel.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention drives the second screw to rotate through a dual-axis motor, driving the sliders at both ends to slide respectively. At the same time, the elastic sliding cooperation between the slider and the adjustment block can synchronously drive the positioning plates at both ends to approach each other, so as to position the output shaft of the gear box extending into the installation groove. Through the V-shaped design of the positioning plate, output shafts of different sizes can be positioned. At the same time, the dual-axis motors respectively control the positioning plates at both ends, so as to diagnose gear boxes of different models and inconsistent output shaft heights, thereby improving the application scope of the equipment.

[0016] 2. The present invention can accurately capture the tiny vibration signal of the gearbox output shaft when it rotates through the coordinated use of the first sensor and the first spring, thereby improving the accuracy and reliability of vibration detection. The coordinated use of the second sensor and the second spring can accurately monitor the relative displacement between the slider and the adjustment block, thereby achieving accurate control of the clamping degree of the positioning plate, ensuring that the gearbox output shaft is stably clamped during the detection process, and reducing errors caused by looseness or vibration.

[0017] 3. The present invention drives the second screw to rotate by a stepper motor. Since the threads on both sides of the intermediate ring are in opposite directions, the limit plates on both sides of the intermediate ring will approach each other until they are in close contact with both sides of the gear box and limit them, ensuring that the gear box will not produce errors due to vibration or looseness during the detection process; providing reliable data support for fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The present invention is a three-dimensional structural schematic diagram of a wind turbine gearbox fault diagnosis device.

[0020] Figure 2 This is a schematic diagram of the support mechanism installation.

[0021] Figure 3 This is a schematic diagram of the positioning mechanism installation.

[0022] Figure 4It is a schematic diagram of the three-dimensional structure of the positioning mechanism.

[0023] Figure 5 This is a schematic diagram of the installation of the first sensor and the second sensor.

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the diagnostic box.

[0025] The accompanying drawings are as follows: 1. diagnostic box; 11. mounting slot; 12. lifting slot; 13. detection slot; 2. positioning plate; 21. wing plate; 22. adjustment block; 23. induction plate; 24. contact block; 25. first spring; 26. first sensor; 3. dual-axis motor; 31. first screw rod; 32. slider; 33. induction slot; 34. second spring; 35. second sensor; 4. support plate; 41. stepping motor; 42. second screw rod; 43. intermediate ring; 44. limit plate; 45. limit slot; 5. display panel; 51. control button. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] like Figures 1 to 6 As shown, a wind turbine gearbox fault diagnosis device includes a diagnosis box 1, a positioning mechanism and a detection mechanism. The side wall of the diagnosis box 1 is provided with a mounting groove 11, and the positioning mechanism is arranged in the mounting groove 11 to position the gearbox output shaft.

[0028] The positioning mechanism includes a positioning plate 2, a dual-axis motor 3, a first screw rod 31 and an adjusting block 22; the side walls on both sides of the installation groove 11 are provided with lifting grooves 12, the dual-axis motor 3 is arranged in the lifting grooves 12, and the first screw rods 31 are connected at both ends of the dual-axis motor 3, and the first screw rod 31 is rotatably arranged in the lifting grooves 12; the positioning plate 2 is a V-shaped structure, and wing plates 21 are arranged on both sides of the positioning plate 2, and the adjusting blocks 22 are arranged on the wing plates 21 on both sides; sliders 32 are arranged on the first screw rods 31 at both ends, and the adjusting blocks 22 are elastically slidably matched with the sliders 32, the two positioning plates 2 located on the first screw rods 31 are symmetrically arranged, and the output shaft of the gear box is arranged between the positioning plates 2; the detection mechanism is arranged at the top and bottom of the installation groove 11, and is respectively connected to the positioning plate 2, and is used to detect the frequency of vibration of the output shaft of the gear box.

[0029] The second screw rod 42 is driven to rotate by the dual-axis motor 3, driving the sliders 32 at both ends to slide respectively. At the same time, the elastic sliding cooperation between the slider 32 and the adjustment block 22 can synchronously drive the positioning plates 2 at both ends to approach each other, and position the output shaft of the gear box extending into the installation groove 11. The V-shaped design of the positioning plate 2 can position output shafts of different sizes. At the same time, the dual-axis motor 3 controls the positioning plates 2 at both ends respectively, and can diagnose gear boxes of different models and inconsistent output shaft heights, thereby improving the scope of application of the equipment. After the output shaft is positioned, the output shaft of the gear box is driven, and the frequency of vibration is detected by the detection mechanism to diagnose whether there is a fault inside the gear box.

[0030] The detection mechanism includes a first sensor 26 and a first spring 25. The mounting groove 11 is provided with a detection groove 13 at the top and bottom. The first sensor 26 is fixedly provided inside the detection groove 13. The positioning plates 2 on both sides are provided with contact blocks 24 on one side facing the top and bottom of the mounting groove 11 respectively. The contact blocks 24 extend into the detection groove 13, and the first spring 25 is provided between the top of the contact block 24 and the first sensor 26.

[0031] Through the coordinated use of the first sensor 26 and the first spring 25 , it is possible to accurately capture a small vibration signal of the output shaft of the gear box during rotation, thereby improving the accuracy and reliability of vibration detection.

[0032] When the output shaft of the gearbox is clamped by the positioning plate 2 and driven to rotate, the vibration of the output shaft will be transmitted to the positioning plate 2 and the contact block 24. The contact block 24 is affected by the vibration and will make a small reciprocating motion in the detection slot 13; this motion will be captured by the first sensor 26 acceleration sensor or displacement sensor and converted into an electrical signal; the electrical signal is then transmitted to the analysis system; the analysis system processes and analyzes the received signal and extracts key parameters such as the frequency and amplitude of the vibration; based on these parameters, it can be determined whether there is a fault inside the gearbox, as well as the type and severity of the fault.

[0033] The side wall of the slider 32 is provided with a sensing groove 33, the side wall of the adjustment block 22 is provided with a sensing plate 23, the sensing plate 23 is slidably arranged in the sensing groove 33, a second sensor 35 is arranged in the sensing groove 33, and a second spring 34 is arranged between the second sensor 35 and the sensing block.

[0034] When the dual-axis motor 3 drives the second screw 42 to rotate, the slider 32 will move along the screw direction. Due to the elastic sliding fit between the induction plate 23 and the slider 32, the induction plate 23 will also slide in the induction slot 33; the movement of the induction plate 23 will change the distance between it and the second sensor 35, and this distance change will be captured by the second sensor 35 and converted into an electrical signal; the electrical signal is then transmitted to the control system; the control system can accurately calculate the relative displacement between the slider 32 and the adjustment block 22 based on the received signal, so as to determine the clamping degree of the positioning plate 2 on the output shaft of the gearbox; when the positioning plate 2 reaches the predetermined clamping degree, the control system will stop the rotation of the dual-axis motor 3 to ensure that the output shaft is stably clamped; at the same time, in the subsequent vibration detection process, the second sensor 35 can also continuously monitor the position change of the induction plate 23, and timely detect the displacement change caused by vibration or looseness, providing additional data support for fault diagnosis.

[0035] By using the second sensor 35 and the second spring 34 in combination, the relative displacement between the slider 32 and the adjustment block 22 can be accurately monitored, thereby achieving precise control of the clamping degree of the positioning plate 2, ensuring that the gearbox output shaft is stably clamped during the detection process, and reducing errors caused by looseness or vibration.

[0036] A supporting mechanism is provided on one side of the diagnostic box 1, and the supporting mechanism includes a supporting plate 4, a stepper motor 41 and a limit plate 44. A limit groove 45 is provided on the support plate 4, and a second screw rod 42 is provided in the limit groove 45. The stepper motor 41 is provided on the side wall of the support plate 4, and its output end is connected to the second screw rod 42. An intermediate ring 43 is provided at the middle position of the second screw rod 42, and the thread teeth on both sides of the intermediate ring 43 are in opposite directions. The limit plates 44 are provided on both sides of the intermediate ring 43, and the bottom of the limit plate 44 is provided on the second screw rod 42, and the top of the limit plate 44 limits the two sides of the gear box.

[0037] When it is necessary to diagnose a fault in the gearbox, the second screw 42 is first driven to rotate by the stepper motor 41. Since the threads on both sides of the intermediate ring 43 are in opposite directions, the limit plates 44 on both sides of the intermediate ring 43 will approach each other until they are in close contact with both sides of the gearbox and limit them, ensuring that the gearbox will not produce errors due to vibration or looseness during the detection process; in the subsequent vibration detection process, the support mechanism can maintain the stability and accuracy of the gearbox, providing reliable data support for fault diagnosis.

[0038] The positioning plate 2 is provided with a rounded corner on one side facing the outside of the installation groove 11 , so that when the output shaft of the gear box is inserted into the installation groove 11 , the friction between the output shaft and the positioning plate 2 is reduced to avoid damage to the output shaft.

[0039] The size of the contact block 24 is adapted to the detection slot 13 , and the size of the sensing plate 23 is adapted to the sensing slot 33 , which effectively improves the stability of the detection.

[0040] A display panel 5 is disposed on the side wall of the diagnosis box 1 , and a plurality of control buttons 51 are disposed on the right side of the display panel 5 .

[0041] The display panel 5 is used to observe data, and the control button 51 is used to control the driving of the dual-axis motor 3 .

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind turbine gearbox fault diagnosis device, comprising a diagnosis box (1), a positioning mechanism and a detection mechanism, wherein a mounting groove (11) is provided on a side wall of the diagnosis box (1), and the positioning mechanism is arranged in the mounting groove (11); It is characterized in that The positioning mechanism comprises a positioning plate (2), a double-axis motor (3), a first screw rod (31) and an adjusting block (22); the side walls of the mounting groove (11) are provided with lifting grooves (12), the double-axis motor (3) is arranged in the lifting grooves (12), and the first screw rod (31) is connected to both ends of the double-axis motor (3), and the first screw rod (31) is rotatably arranged in the lifting grooves (12); The positioning plate (2) is of a V-shaped structure, and wing plates (21) are arranged on both sides of the positioning plate (2), and the adjusting blocks (22) are arranged on the wing plates (21) on both sides; sliders (32) are arranged on the first screw rods (31) at both ends, and the adjusting blocks (22) and the sliders (32) are elastically slidably matched, and the two positioning plates (2) located on the first screw rod (31) are symmetrically arranged, and the output shaft of the gear box is arranged between the positioning plates (2); The detection mechanism is arranged at the top and bottom of the installation groove (11), and is respectively connected to the positioning plate (2), and is used to detect the frequency of vibration of the output shaft of the gear box.

2. A wind turbine gearbox fault diagnosis device according to claim 1, characterized in that: The detection mechanism comprises a first sensor (26) and a first spring (25); the top and bottom of the mounting groove (11) are provided with detection grooves (13); the first sensor (26) is fixedly arranged inside the detection groove (13); the positioning plates (2) on both sides are provided with contact blocks (24) respectively facing the top and bottom of the mounting groove (11); the contact blocks (24) extend into the detection groove (13); and the first spring (25) is arranged between the top of the contact block (24) and the first sensor (26).

3. A wind turbine gearbox fault diagnosis device according to claim 2, characterized in that: The side wall of the slider (32) is provided with a sensing groove (33), the side wall of the adjustment block (22) is provided with a sensing plate (23), the sensing plate (23) is slidably arranged in the sensing groove (33), a second sensor (35) is arranged in the sensing groove (33), and a second spring (34) is arranged between the second sensor (35) and the sensing block.

4. A wind turbine gearbox fault diagnosis device according to claim 1, characterized in that: A support mechanism is provided on one side of the diagnostic box (1), and the support mechanism comprises a support plate (4), a stepper motor (41) and a limit plate (44). A limit slot (45) is provided on the support plate (4), and a second screw rod (42) is provided in the limit slot (45). The stepper motor (41) is provided on the side wall of the support plate (4), and its output end is connected to the second screw rod (42). An intermediate ring (43) is provided at the middle position of the second screw rod (42), and the thread teeth on both sides of the intermediate ring (43) are in opposite directions. The limit plates (44) are provided on both sides of the intermediate ring (43), and the bottom of the limit plate (44) is provided on the second screw rod (42), and the top of the limit plate (44) limits the two sides of the gear box.

5. A wind turbine gearbox fault diagnosis device according to claim 1, characterized in that: A rounded corner is provided on one side of the positioning plate (2) facing the outside of the mounting groove (11).

6. A wind turbine gearbox fault diagnosis device according to claim 2, characterized in that: The size of the contact block (24) is adapted to the detection slot (13).

7. A wind turbine gearbox fault diagnosis device according to claim 3, characterized in that: The size of the sensing plate (23) is adapted to the size of the sensing slot (33).

8. A wind turbine gearbox fault diagnosis device according to claim 1, characterized in that: A display panel (5) is arranged on the side wall of the diagnosis box (1), and a plurality of control buttons (51) are arranged on the right side of the display panel (5).

Images