A rain erosion simulation mechanism and a wind turbine blade testing apparatus employing the same

Abstract

The present application relates to the technical field of wind power blade testing, in particular to a rain erosion simulation mechanism and a wind power blade testing device using the same, which comprises a fine spraying and drying mechanism and a base detection mechanism, the fine spraying and drying mechanism and the base detection mechanism are used for environmental simulation, dry and wet aging strengthening and base connection structure reliability monitoring of the wind power blade under the rain erosion working condition; a main transmission mechanism is used for driving control of the fine spraying and drying mechanism and the base detection mechanism. The present application can monitor the reliability of environmental simulation, dry and wet aging strengthening and base connection structure under the rain erosion working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine blade testing, in particular to a rain erosion simulation mechanism and a wind turbine blade testing device using the same. BACKGROUND

[0002] During long-term service, the base connection structure (such as a bolt) of a wind turbine blade is prone to electrochemical corrosion and stress corrosion cracking due to long-term exposure to a rain erosion environment, which is one of the main risk points of blade failure. The traditional rain erosion testing device has the following technical bottlenecks.

[0003] The existing testing device can restore the natural rain erosion process to some extent, but there is still a significant lack of detection capability for the key area of the blade base bolt connection. On the one hand, the spraying system of the existing device is designed in a whole covering manner, which is difficult to accurately focus on the hidden parts such as the joint gap between the base bolt and the blade flange, the fitting surface between the bolt head and the base, and the like, which are prone to water accumulation and corrosion, resulting in an unrealistic simulation of the rainwater penetration effect and the inability to reproduce the core corrosion path of "rainwater seeping into the gap-pollutant concentration erosion" in actual working conditions.

[0004] Moreover, it is unable to timely detect bolt fracture. In the rainwater detection environment, the use of electronic devices is greatly affected, and it is unable to timely remind the detection personnel whether the bolt is corroded and fractured. SUMMARY

[0005] In order to overcome the above technical problems, the purpose of the present application is to provide a rain erosion simulation mechanism and a wind turbine blade testing device using the same, so as to solve the problem of the lack of detection of the wind blade base connection structure in the existing detection device in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] A rain erosion simulation mechanism includes a wind turbine blade assembly, further comprising: a fine spray drying mechanism and a base inspection mechanism, wherein the fine spray drying mechanism and the base inspection mechanism are used for environmental simulation under rain erosion conditions, wet and dry aging enhancement, and reliability monitoring of the base connection structure of the wind turbine blade assembly; a main drive mechanism for driving and controlling the fine spray drying mechanism and the base inspection mechanism; the base inspection mechanism is installed at the base of the wind turbine blade assembly, the base inspection mechanism includes a connecting plate, the connecting plate and the base of the wind turbine blade assembly are connected by a base connecting bolt, and a connecting assembly is connected between the connecting plate and the back plate body; the base inspection mechanism is periodically driven to rotate by the main drive mechanism for monitoring the connection plate and the wind turbine blade assembly. The connection status of the blade base is detected. When the base connecting bolts corrode and break, the rotating connecting disc triggers an alarm. The fine spray drying mechanism is fitted over the wind turbine blade. The fine spray drying mechanism includes an annular frame. A central spray component and a side spray component are installed inside the annular frame. The central spray component sprays liquid onto the surface of the wind turbine blade. The side spray components spray the connection position between the base of the wind turbine blade and the connecting disc. The annular frame is rotatably connected to a main frame. A simulated sunlight lamp group is also installed inside the annular frame. A front rotating wind blade is detachably installed on one side of the annular frame. The front rotating wind blade and the simulated sunlight lamp group work together to quickly ventilate and dry the surface and base of the wind turbine blade.

[0008] Preferably, there are two central spray units and two simulated sunlight lamp groups, and the two central spray units and simulated sunlight lamp groups are symmetrically installed on the inner wall of the annular frame. The central spray units and the side spray units are connected to simulated rainwater storage tanks through liquid pipes. The front rotating fan blades are detachably connected to the annular frame by bolts.

[0009] Preferably, when the front rotating blade rotates with the annular frame, it generates wind force to accelerate the airflow on the surface and base of the wind turbine blade, and the bottom of the main frame contacts the ground.

[0010] Preferably, the back plate body is connected to the main frame via a bearing, and the connecting assembly includes a first connector, a second connector, and a spring. The first connector is fixedly connected to the back plate body, the spring is fixedly connected to the connecting plate, the second connector is connected between the first connector and the spring, and the side of the connecting plate is provided with a side protrusion rod and an alarm assembly.

[0011] Preferably, when the back plate is driven by the main transmission mechanism to rotate slightly, the connecting part 2 in the connecting assembly stores force to retract or extend. When the base connecting bolt is not corroded or broken, the connecting plate will not be driven to rotate by the back plate and the connecting assembly. When the base connecting bolt is corroded or broken, the connecting plate will be driven to rotate by the back plate and the connecting assembly. At this time, the side protrusion rod triggers a prompt alarm through the contact alarm assembly.

[0012] Preferably, the alarm assembly includes two trigger sensors located on the upper and lower sides of the side protrusion. The trigger sensors in the alarm assembly are electrically connected to a buzzer, which sounds an alarm when the trigger sensor is triggered.

[0013] Preferably, the main transmission mechanism includes a main shaft, on which an intermittent drive gear and a full drive gear are mounted. The intermittent drive gear meshes with a driven gear, and the full drive gear meshes with a driven gear.

[0014] Preferably, the spindle is connected to the main frame via bearings, and both the intermittent drive gear and the full drive gear are fixedly connected to the spindle via holes.

[0015] Preferably, the driven gear is fixedly connected to the side of the back plate body, the annular frame is fixedly connected to the driven gear, and one end of the main shaft is connected to a reduction motor.

[0016] A wind turbine blade testing device employs the aforementioned rain erosion simulation mechanism.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The fine spray drying mechanism achieves uniform spraying of the entire circumference of the wind turbine blade surface and base connection area through the synergistic action of the central spray component and the side spray component. In particular, it performs directional penetration into the gap between the base connection bolts and the blade base, simulating the scenario of rainwater flowing along the blade surface and soaking into the connection structure during actual rainfall. After spraying, the simulated solar lamp group works with the front rotating wind blade to accelerate the evaporation of moisture through heating and airflow, forming a "wetting-drying" cycle. This enhances the concentration and erosion effect of pollutants (such as salt) at the connection interface, significantly shortens the detection cycle, and is closer to the real service environment.

[0019] When the bolts are not corroded, the rotational force of the back plate is offset by the bolt tightening force, and the spring only undergoes elastic deformation. Once the bolt breaks due to rain corrosion, the spring releases its stored energy to drive the connecting plate to rotate, so that the side protrusion on the side of the connecting plate directly contacts the upper and lower dual trigger sensors in the alarm assembly. The main function is to detect the service life of the wind turbine base bolt connection in rainy environment, and to directly alert the inspection personnel after the connection fails.

[0020] The base inspection mechanism is rigidly connected to the blade base through base connecting bolts, and the fine spray drying mechanism is fitted on the outside of the blade through an annular frame. The two are dynamically coupled through the main shaft of the main drive mechanism. This design allows the equipment to be quickly installed without disassembling the blade, avoiding the spatial interference problem of traditional fixed inspection devices.

[0021] The designed testing mechanism generates a small-amplitude vibration on the connecting plate each time the back plate rotates, causing the connecting structure to vibrate. This simulates the natural vibration of a wind turbine blade under the influence of wind during operation, further improving the testing effect of the overall testing mechanism.

[0022] The main drive mechanism achieves closed-loop control of rain erosion simulation and connection detection simultaneously through the composite transmission of full-drive gear and intermittent drive gear. The full-drive gear drives the ring frame to rotate at a uniform speed to ensure the circumferential uniformity of spraying and drying. The intermittent drive gear drives the back plate to rotate periodically with a tooth ratio to achieve the "detection-reset" cycle, avoiding additional load interference to unfailed bolts caused by continuous rotation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall front structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall rear structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall internal structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the front rotating fan blade part of the present invention;

[0027] Figure 5 This is a schematic cross-sectional view of the present invention;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point A;

[0029] Figure 7 This is an exploded structural diagram of the base detection mechanism of the present invention.

[0030] In the diagram: 01. Wind turbine blade; 02. Fine spray drying mechanism; 21. Annular frame; 22. Central spray component; 23. Side spray component; 24. Front rotating wind blade; 25. Main frame; 26. Simulated solar lamp assembly; 03. Base detection mechanism; 31. Connecting plate; 32. Base connecting bolt; 33. Back plate body; 34. Connecting assembly; 341. Connector 1; 342. Connector 2; 343. Spring component; 35. Side protruding rod; 36. Alarm assembly; 04. Main transmission mechanism; 41. Main shaft component; 42. Intermittent drive gear; 43. Driven gear component; 44. Full drive gear; 45. Driven gear. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] One embodiment provided by the present invention:

[0033] A rain erosion simulation mechanism includes a wind turbine blade component 01, which also includes [missing information].

[0034] The fine spray drying mechanism 02 and the base testing mechanism 03 are used to simulate the environment under rain erosion conditions, strengthen the dry and wet aging, and monitor the reliability of the base connection structure of the wind turbine blade 01.

[0035] The main drive mechanism 04 is used to drive and control the fine spray drying mechanism 02 and the base detection mechanism 03;

[0036] The base detection mechanism 03 is installed at the base of the wind turbine blade 01. The base detection mechanism 03 includes a connecting plate 31. The connecting plate 31 and the base of the wind turbine blade 01 are connected by a base connecting bolt 32. A connecting assembly 34 is connected between the connecting plate 31 and the back plate body 33. The base detection mechanism 03 is periodically driven to rotate by the main transmission mechanism 04 to detect the connection status between the connecting plate 31 and the base of the wind turbine blade 01. When the base connecting bolt 32 is corroded and broken, the rotation of the connecting plate 31 triggers an alarm.

[0037] The fine spray drying mechanism 02 is fitted over the wind turbine blade 01. The fine spray drying mechanism 02 includes an annular frame 21. A central spray component 22 and a side spray component 23 are installed inside the annular frame 21. The central spray component 22 is used to spray liquid onto the surface of the wind turbine blade 01. The side spray component 23 is used to spray the base of the wind turbine blade 01 at the connection position with the connecting plate 31. The annular frame 21 is rotatably connected to a main frame 25. A simulated sunlight lamp group 26 is also installed inside the annular frame 21. A front rotating wind blade 24 is detachably installed on one side of the annular frame 21. The front rotating wind blade 24 and the simulated sunlight lamp group 26 work together to quickly ventilate and dry the surface and base of the wind turbine blade 01.

[0038] Two central spray elements 22 and two simulated sunlight lamp groups 26 are provided, and the two central spray elements 22 and simulated sunlight lamp groups 26 are symmetrically installed on the inner wall of the annular frame 21. The central spray elements 22 and the side spray elements 23 are connected to simulated rainwater storage tanks through liquid pipes. The front rotating fan blades 24 are detachably connected to the annular frame 21 by bolts.

[0039] When the front rotating blade 24 rotates with the annular frame 21, it generates wind force to accelerate the airflow on the surface of the wind turbine blade 01 and at the base of the wind turbine blade 01, and the bottom of the main frame 25 contacts the ground.

[0040] The back plate body 33 is connected to the main frame 25 via bearings. The connecting assembly 34 includes a first connector 341, a second connector 342, and a spring 343. The first connector 341 is fixedly connected to the back plate body 33, the spring 343 is fixedly connected to the connecting plate 31, and the second connector 342 is connected between the first connector 341 and the spring 343. The side of the connecting plate 31 is provided with a side protrusion rod 35 and an alarm assembly 36.

[0041] When the back plate 33 is driven by the main transmission mechanism 04 to rotate slightly, the connecting part 342 in the connecting assembly 34 stores force to retract or extend. When the base connecting bolt 32 is not corroded and broken, the connecting plate 31 will not be driven to rotate by the back plate 33 and the connecting assembly 34. When the base connecting bolt 32 is corroded and broken, the connecting plate 31 will be driven to rotate by the back plate 33 and the connecting assembly 34. At this time, the side protrusion rod 35 triggers a prompt alarm through the contact alarm assembly 36.

[0042] The alarm assembly 36 includes two trigger sensors, which are located on the upper and lower sides of the side protrusion 35. The trigger sensors in the alarm assembly 36 are electrically connected to a buzzer, which sounds an alarm when the trigger sensor is triggered.

[0043] The main transmission mechanism 04 includes a main shaft 41, on which an intermittent drive gear 42 and a full drive gear 44 are mounted. The intermittent drive gear 42 meshes with a driven gear 43, and the full drive gear 44 meshes with a driven gear 45.

[0044] The main spindle 41 is connected to the main frame 25 via bearings. The intermittent drive gear 42 and the full drive gear 44 are both fixedly connected to the main spindle 41 through holes. The driven gear 43 is fixedly connected to the side of the back plate 33. The annular frame 21 is fixedly connected to the driven gear 45. One end of the main spindle 41 is connected to a reduction motor.

[0045] Working principle:

[0046] This equipment utilizes a collaborative process of "rain erosion environment simulation, wet-dry cycle enhancement, and connection reliability monitoring" to test the rain erosion resistance of the wind turbine blade base and connection structure. The specific procedure is as follows: Before testing, the wind turbine blade component 01 to be tested is horizontally fixed to a metal bracket, ensuring its base is exposed. The entire equipment is then moved to the blade base position. The connecting plate 31 of the base testing mechanism 03 is connected to the base of the blade component 01 via base connecting bolts 32, ensuring that the back plate 33 is rotatably connected to the main frame 25 via bearings, and the connecting component 34 is in a natural state. The annular frame 21 of the fine spray drying mechanism 02 is fitted onto the base from the blade, and the bottom of the main frame 25 is firmly in contact with the ground. Finally, the central spray component 22 (aligned with the blade surface) and the side spray component 23 (aligned with the gap between the base and the connecting plate 31) are installed and connected to the simulated rainwater storage tank. The front rotating blade 24 is fixed to the side of the annular frame 21 with bolts—this installation sequence avoids interference between pre-installed components and the blade, ensuring smooth equipment placement.

[0047] After the equipment is started, the geared motor of the main transmission mechanism 04 drives the main shaft 41 to rotate, which drives the full drive gear 44 to make the annular frame 21 rotate around the blade 01 at a constant speed through the driven gear 45, thus starting the "spraying and wetting-drying aging" cycle: In the first stage, the middle spray component 22 sprays rainwater simulation liquid onto the blade surface and the side spray component 23 sprays rainwater simulation liquid onto the base connection seam and the base connection bolt 32, so as to achieve uniform wetting in the entire circumference, especially ensuring that the liquid penetrates into the connection seam, simulating the actual rainwater soaking scenario; In the second stage, after the spraying stops, the annular frame 21 continues to rotate, simulating the starting of the solar lamp group 26 to heat up (simulating sunlight), and the front rotating fan blade 24 rotates to generate airflow. The two work together to accelerate the evaporation of water, complete the "wetting-drying" natural aging simulation, and enhance the pollutant erosion effect. The two stages automatically cycle until the preset time or an alarm is triggered.

[0048] During the rain erosion cycle, the main shaft 41 drives the intermittent drive gear 42 to rotate (only areas 1 and 6 have teeth). Each rotation briefly engages the driven gear 43, driving the back plate 33 to rotate slightly. If the base connecting bolt 32 is not corroded and broken, the connecting plate 31 is rigidly fixed to the blade base, and the rotational force of the back plate 33 is offset by the bolt tightening force. The connecting part 342 stores energy and contracts or extends. After disengaging, the connecting part 342 releases its stored energy, causing the back plate 33 to reset. If the bolt breaks due to rain erosion, the rigid connection between the connecting plate 31 and the blade fails. The back plate 33 drives the connecting plate 31 to rotate through the connecting assembly 34, causing the side protrusion 35 on the side of the connecting plate 31 to trigger the dual-position trigger sensor in the alarm assembly 36. The sensor drives the buzzer to sound an alarm, indicating that the base connection structure has failed. The entire system is driven uniformly by the main transmission mechanism, achieving deep coupling between rain erosion simulation and connection detection, and completing the comprehensive testing of the blade base's rain erosion resistance and connection safety.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An erosion simulation mechanism comprising a wind turbine blade piece, characterized in that, Also include: Fine spray drying mechanism and base detection mechanism, the fine spray drying mechanism and base detection mechanism are used for environmental simulation under rain erosion working condition, dry and wet aging strengthening and base connecting structure reliability monitoring to wind power blade piece; Main transmission mechanism, which is used for driving control of the fine spray drying mechanism and the base detection mechanism; The base detection mechanism is installed at the base of the wind power blade piece, and the base detection mechanism comprises a connecting disc, the connecting disc and the base of the wind power blade piece are connected with a base connecting bolt, the connecting disc and the back disc body are connected with a connecting assembly, the base detection mechanism is driven to rotate periodically by the main transmission mechanism for detecting the connection state of the connecting disc and the base of the wind power blade piece, when the base connecting bolt is corroded and broken, the connecting disc rotates to trigger a warning alarm; The fine spray drying mechanism is sleeved outside the wind power blade piece, the fine spray drying mechanism comprises an annular frame, the annular frame is provided with a middle spray piece and a side spray piece, the middle spray piece is used for spraying liquid to the surface of the wind power blade piece, the side spray piece is used for spraying the connecting position of the base of the wind power blade piece and the connecting disc, the annular frame is rotatably connected with a main rack, the annular frame is further provided with a simulated sunshine lamp group, one side of the annular frame is detachably provided with a front rotating fan blade, the front rotating fan blade and the simulated sunshine lamp group are matched to quickly ventilate and dry the surface of the wind power blade piece and the base of the wind power blade piece. When the back disc body is driven by the main transmission mechanism to rotate slightly, the connecting piece two in the connecting assembly is contracted or stretched, when the base connecting bolt is not corroded and broken, the connecting disc will not be rotated by the back disc body and the connecting assembly, when the base connecting bolt is corroded and broken, the connecting disc will be rotated by the back disc body and the connecting assembly, at this time, the side convex rod triggers the warning alarm through the contact alarm assembly.

2. An erosion simulation mechanism according to claim 1, wherein: The middle spray piece and the simulated sunshine lamp group are provided with two, and the two middle spray pieces and the simulated sunshine lamp group are symmetrically installed on the inner wall of the annular frame, the middle spray piece and the side spray piece are connected with a simulated rainwater storage tank through a liquid pipe outside, and the front rotating fan blade is detachably connected with the annular frame through a bolt.

3. An erosion simulation mechanism according to claim 1, wherein: The front rotating fan blade generates wind force to accelerate the air flow of the surface of the wind power blade piece and the base of the wind power blade piece when rotating with the annular frame, and the main rack bottom contacts the ground.

4. An erosion simulation mechanism according to claim 1, wherein: The back disc body is connected with the main rack through a bearing, the connecting assembly comprises a connecting piece one, a connecting piece two and a spring piece, the connecting piece one is fixedly connected with the back disc body, the spring piece is fixedly connected with the connecting disc, the connecting piece two is connected between the connecting piece one and the spring piece, and the side surface of the connecting disc is provided with a side convex rod and an alarm assembly.

5. An erosion simulation mechanism according to claim 1, wherein: The alarm assembly comprises two trigger sensors, and the two trigger sensors are located on the upper and lower sides of the side convex rod, the trigger sensors in the alarm assembly are electrically connected with a buzzer, and the buzzer emits sound to prompt the alarm when the trigger sensors are triggered.

6. An erosion simulation mechanism according to claim 1, wherein: The main transmission mechanism comprises a main shaft piece, the main shaft piece is provided with an intermittent driving gear and a full drive gear, the intermittent driving gear is engaged with a driven tooth piece, and the full drive gear is engaged with a driven gear.

7. An erosion simulation mechanism according to claim 6, wherein: The main shaft is connected with the main frame through a bearing, and the intermittent driving gear and the full driving gear are fixedly connected with the main shaft through holes.

8. An erosion simulation mechanism according to claim 6, wherein: The driven gear is fixedly connected to the side of the back disc body, the annular frame is fixedly connected with the driven gear, and one end of the main shaft is connected with a speed reducer motor.

9. A wind turbine blade testing apparatus, characterized in that, The rain erosion simulation mechanism according to any one of claims 1-8.

Images