CN109342047A - Blade stability test method and test tool - Google Patents

Abstract

The invention relates to a blade stability test method and a test tool. The stability test method includes: providing a leaf segment to be tested, pasting a sensing element on the to-be-measured part of the leaf segment; placing the leaf segment on the test tool along a predetermined direction In the clamping device, the two ends of the blade segment along its own length direction are clamped by the clamping device; the driving mechanism of the test tool is activated to drive the clamping device to apply a pressing force to the part to be tested of the blade segment, wherein, The clamping device is provided with a rotating shaft corresponding to the end of the blade segment opposite to the part to be measured; the data measured by the sensing element is acquired. The stability test method can verify the stability of the trailing edge of the entire blade by pre-testing the stability of the blade segment, thereby reducing the material cost of manufacturing the blade, shortening the design cycle of the blade, and improving the verification efficiency of the blade.

Description

Blade stability test method and test tool

technical field

The invention relates to the technical field of wind power generation, in particular to a blade stability test method and a test tool.

Background technique

Before the blades in wind turbines are put into production, static tests are generally required to verify the stability of the trailing edge of the blades. As shown in Figure 1, in the static test method in the prior art, one end of the root B1 of the blade B is usually fixed, and the other end B2 of the blade B is placed freely, and then several hoisting positions are selected along the length of the blade B. The blade B is stretched in the direction indicated by the arrow in 1 for a certain distance, and the local area A of the trailing edge of the blade is squeezed due to the deformation of the blade B. The strain data of the local area A of the trailing edge can be measured with a strain gauge. Finally, the measured strain data is compared with the theoretical strain data to estimate the stability of the trailing edge of the blade.

However, the above solution must produce a full-scale blade, and only a part of it is actually measured, which is costly. In addition, although other structural parameters can be measured by manufacturing full-scale blades for testing, when the stability of the trailing edge needs to be calculated and verified in advance, it is necessary to wait for the full-scale blade to be processed before measuring the stability of the trailing edge, and the verification time is too long. It affects the design cycle of the blade.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a blade stability test method and a test tool, which can verify the stability of the entire blade by pre-testing the stability of the blade segments.

In one aspect, an embodiment of the present invention provides a method for testing blade stability, the stability testing method comprising: providing a blade segment to be tested, pasting a sensing element on a part to be tested of the blade segment; placing the blade segment along a predetermined direction In the clamping device of the test tool, the two ends of the blade segment along its own length direction are clamped by the clamping device; the driving mechanism of the test tool is activated to drive the clamping device to apply a pressing force to the part to be tested of the blade segment , wherein the clamping device is provided with a rotating shaft corresponding to the end of the blade segment opposite to the part to be measured; the data measured by the sensing element is acquired.

According to an aspect of the embodiment of the present invention, the part to be measured of the blade segment is the trailing edge of the blade, and the predetermined direction is the direction in which the leading edge of the blade segment is placed downward and the trailing edge is placed upward.

According to an aspect of the embodiment of the present invention, the magnitude of the pressing force F satisfies the formula (1):

F=(F0×L1)/L2 (1)

Wherein, F0 is the driving force of the driving mechanism, L1 is the first distance between the output shaft of the driving mechanism and the rotating shaft, and L2 is the second distance between the part to be measured of the blade segment and the rotating shaft.

On the other hand, an embodiment of the present invention provides a blade stability test tool, the stability test tool includes: a base; a clamping device, including a first column and a second column oppositely arranged, the first column and the second column There are opposite first ends and second ends along its height direction, the first ends of the first column and the second column are rotatable relative to the base; the driving mechanism is connected to the second end of the first column and the second end of the second column. between the second ends; wherein, the blade segment to be tested is placed between the first column and the second column along a predetermined direction, so that both ends of the blade segment along its own length direction are clamped by the clamping device, and the clamping device passes The drive mechanism applies a squeezing force to the portion of the blade segment to be measured.

According to an aspect of the embodiments of the present invention, the part to be measured of the blade segment is the trailing edge of the blade, the predetermined direction is that the leading edge of the blade segment corresponds to the second ends of the first and second columns, and the trailing edge corresponds to the first The orientation in which the first ends of the uprights and the second uprights are placed.

According to an aspect of the embodiment of the present invention, the clamping device further includes a first clamping plate and a second clamping plate arranged opposite to each other, the first clamping plate is fixedly connected to the first column, the second clamping plate is fixedly connected to the second column, and the clamping device passes through the first column. A splint and a second splint hold the blade segments.

According to an aspect of the embodiment of the present invention, a first through groove is provided on the first clamping plate, the first through groove is adapted to the cross-sectional shape of one end of the blade segment to be clamped, and a second through groove is provided on the second clamping plate , the second through groove is adapted to the cross-sectional shape of the other end of the blade segment to be clamped.

According to an aspect of the embodiment of the present invention, the clamping device further includes a pair of fixing bases, and the pair of fixing bases are respectively fixedly connected with the second end of the first column and the second end of the second column; the driving mechanism includes a body connected to each other. part and the output shaft, wherein one fixed seat is connected with the main body part, and the other fixed seat is connected with the output shaft.

According to an aspect of the embodiment of the present invention, the base includes a base and a fixing frame fixedly connected to the base, a pair of rotating shafts are arranged on the fixing frame, and the first end of the first column and the first end of the second column are respectively connected to the rotating shaft through the rotating shaft. The base is pivotally connected.

According to an aspect of the embodiment of the present invention, the fixing frame includes a first beam placed horizontally and a pair of second beams arranged to intersect with the first beam, and a rotating shaft is disposed on the second beams.

According to an aspect of the embodiment of the present invention, the fixing frame further includes a third beam, one end of the third beam is connected to the first beam, and the other end is connected to the second beam.

According to an aspect of the embodiments of the present invention, the driving mechanism is any one of a hydraulic cylinder, an air cylinder and an electric push rod.

The embodiment of the present invention provides a method for testing blade stability, which verifies the stability of the entire blade by pre-testing the stability of the blade segments, thereby reducing the material cost of manufacturing the blade, shortening the design cycle of the blade, and improving the verification of the blade efficiency. In addition, the embodiment of the present invention provides a blade stability test tool, by placing the blade segment in the clamping device of the test tool according to a predetermined direction, and starting the driving mechanism to drive the clamping device to apply pressure to the part to be tested of the blade segment. Pressure, simple structure, easy to achieve.

Description of drawings

Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is the schematic diagram of a kind of blade stability testing method in the prior art;

2 is a schematic diagram of a blade stability testing method provided by an embodiment of the present invention;

Fig. 3 is the flow chart of a kind of blade stability test method shown in Fig. 2;

4 is a schematic structural diagram of a blade stability test tool provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of the first splint in the stability testing tool shown in FIG. 4 .

Fig. 6 is the structural representation that the stability test tool shown in Fig. 4 removes a part of the fixing frame;

FIG. 7 is a schematic structural diagram of the stability test tool shown in the direction A in FIG. 4 .

in,

10-base; 11-base; 111-fixed slot; 12-fixed frame; 121-first beam; 122-second beam; 123-third beam; 13-rotating shaft;

20-clamping device; 21-first column; 22-second column; 23-first splint; 231-first through groove; 24-second splint; 25-fixed seat; a-first end; b- second end;

30 - drive mechanism; 31 - body part; 32 - output shaft; L1 - first distance; L2 - second distance; F - leading edge of leaf segment; R - trailing edge of leaf segment.

In the drawings, the same components are given the same reference numerals. The drawings are not drawn to actual scale.

Detailed ways

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention; and, the dimensions of some structures may be exaggerated for clarity. Furthermore, the features, structures or characteristics described below may be combined in any suitable manner in one or more embodiments.

The orientation words appearing in the following description are all the directions shown in the drawings, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In order to better understand the present invention, the blade stability test method and the test tool provided by the embodiments of the present invention are described in detail below with reference to FIGS. 2 to 7 .

Please refer to FIG. 2 and FIG. 3 together. An embodiment of the present invention provides a method for testing blade stability. The method for testing stability includes:

Step S1: Provide the leaf segment B to be tested, and paste the sensing element T on the to-be-tested part of the leaf segment B.

In order to shorten the design cycle of the blade and improve the verification efficiency of the blade, only the part B of the blade that needs to be measured for stability can be produced for testing. The sensing element T can be a strain gauge or a displacement gauge. The strain gauge is used to measure the strain value of the part to be measured after being subjected to the pressing force, and the displacement gauge is used to measure the deformation and displacement of the part to be measured after being subjected to the pressing force. The sensing element T Depends on specific testing needs.

Step S2 : placing the blade segment B in the clamping device 20 of the test tool along a predetermined direction, so that both ends of the blade segment B along its own length direction are clamped by the clamping device 20 .

Step S3: Activate the drive mechanism 30 of the test tool to drive the clamping device 20 to apply a pressing force F to the part to be measured of the blade segment B, wherein the clamping device 20 is set corresponding to the end of the blade segment opposite to the part to be measured There is a rotating shaft 13 .

Step S4: Acquire data measured by the sensing element T.

The blade stability test method provided by the embodiment of the present invention verifies the stability of the entire blade by pre-testing the stability of the blade segment B, and does not need to provide the entire blade for testing, which reduces the material cost for manufacturing the blade and shortens the design of the blade cycle, which improves the validation efficiency of the blade.

Since the trailing edge of the blade is prone to extrusion deformation due to blade deformation during the hoisting process, in this application, in order to measure the stability of the trailing edge of the entire blade, the stability of the trailing edge R of the blade segment B can be measured in advance. The part to be tested of the leaf segment B is the trailing edge R, and the sensing element T is pasted on the part to be tested of the leaf segment B. The predetermined direction is the direction in which the leading edge F of the blade segment B is placed downward and the trailing edge R is placed upward.

It can be understood that, in order to measure the stability of other parts of the blade, the sensing element T can also be pasted on other parts of the blade segment B, and the predetermined direction of the blade is changed accordingly to measure the corresponding data.

Further, the driving mechanism 30 drives the clamping device 20 to apply a pressing force F to the trailing edge R of the blade segment B. The magnitude of the pressing force F can be calculated by the lever principle. As shown in Figure 3, the magnitude of the extrusion force F satisfies the formula (1):

F=(F0×L1)/L2 (1)

Wherein, F0 is the driving force of the output shaft of the driving mechanism 30 , L1 is the first distance between the output shaft of the driving mechanism 30 and the rotating shaft 13 , and L2 is the second distance between the to-be-measured part of the blade segment B and the rotating shaft 13 . When the location to be measured is the trailing edge R, L2 is the second distance between the trailing edge R of the blade segment B and the rotating shaft 13 .

The specific structure of the test tool used in the above-mentioned blade stability test method will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 4 , an embodiment of the present invention provides a blade stability test tool, the stability test tool includes: a base 10 , a clamping device 20 and a drive mechanism 30 .

The clamping device 20 includes a first upright post 21 and a second upright post 22 which are oppositely arranged. The first upright post 21 and the second upright post 22 have opposite first ends a and second ends b along their height directions. The first upright posts 21 and 22 have opposite ends. The first end a of the second column 22 is rotatable relative to the base 10 .

The driving mechanism 30 is connected between the second end b of the first column 21 and the second end b of the second column 22 , wherein the blade segment B to be tested is placed between the first column 21 and the second column 22 along a predetermined direction. time, so that both ends of the blade segment B along its own length direction are clamped by the clamping device 20 . The clamping device 20 applies a pressing force to the portion to be measured of the blade segment through the driving mechanism 30 .

In the stability test tool for the trailing edge of the blade provided by the embodiment of the present invention, the blade segment B is placed in the clamping device 20 of the test tool according to a predetermined direction, and the driving mechanism 30 is activated to drive the clamping device 20 to the waiting position of the blade segment B. Extrusion force is applied to the measuring part, and the structure is simple and easy to realize.

In the present application, in order to measure the stability of the trailing edge of the entire blade, the stability of the trailing edge R of the blade segment B may be measured in advance. That is, the position to be measured of the blade segment B is the trailing edge R of the blade, the predetermined direction is that the leading edge F of the blade segment B is placed corresponding to the second end b of the first column 21 and the second column 22, and the trailing edge R corresponds to the first The direction in which the first ends a of the uprights 21 and the second uprights 22 are placed.

It can be understood that, in order to measure the stability of other parts of the blade, the sensing element T can also be pasted on other parts of the blade segment B, and the predetermined direction of the blade is changed accordingly to measure the corresponding data.

Further, the clamping device 20 also includes a first clamping plate 23 and a second clamping plate 24 that are oppositely arranged, the first clamping plate 23 is fixedly connected to the first column 21, the second clamping plate 24 is fixedly connected to the second column 22, and the clamping device 20 The blade segment B is clamped by the first clamping plate 23 and the second clamping plate 24 .

In order to prevent the first splint 23 and the second splint 24 from scratching or destroying the blade segment B, the first splint 23 and the second splint 24 can be made of wooden materials to reduce the size of the first splint 23 and the second splint 24 and the blade segment. friction between B.

Specifically, referring to FIG. 5, in order to prevent the blade segment B from rotating relative to the first clamping plate 23 and the second clamping plate 24, the first clamping plate 23 is provided with a first through groove 231, and the first through groove 231 and the blade segment B are clamped The cross-sectional shape of one end of the blade segment B is adapted, and the second splint 24 is provided with a second through slot (not shown in the figure), and the second through slot is adapted to the cross-sectional shape of the other end of the blade segment B to be clamped. . Taking the first clamping plate 23 as an example, the point P1 of the first through groove 231 corresponds to the trailing edge R of the blade segment B, and the point P2 corresponds to the leading edge F of the blade segment B. When the cross-sectional shapes of the clamped ends of the blade segment B are the same, the shapes of the first through grooves 231 and the second through grooves are arranged in a mirror image. When the cross-sectional shapes of the two ends where the blade segment B is clamped are different, the shapes of the first through grooves 231 and the second through grooves are similar and arranged in a mirror image.

Thus, one end of the blade segment B along its own length direction passes through the first through groove 231 of the first clamping plate 23, and the other end of the blade segment B along its own length direction passes through the second through groove of the second clamping plate 24, and is clamped by It is held between the first column 21 and the second column 22 .

Since the cross-sectional shapes of the clamped ends of the blade segment B are complex curves, when the thickness of the blade segment B is thick, it is difficult to ensure the machining accuracy of the first through grooves 231 and the second through grooves. In order to facilitate processing, both the first clamping plate 23 and the second clamping plate 24 may be provided as a multi-layer thin plate composite structure.

In addition, the clamping device 20 further includes a pair of fixed seats 25, which are respectively fixedly connected with the second end b of the first column 21 and the second end b of the second column 22; the driving mechanism 30 includes interconnected As for the main body part 31 and the output shaft 32 , one of the fixing bases 25 is connected with the main body part 31 , and the other fixing base 25 is connected with the output shaft 32 . When the output shaft of the driving mechanism 30 is shortened, the second ends b of the first upright column 21 and the second upright column 22 can be driven to pivot around the respective first ends a and move inwardly, so that the first clamp plate 23 and the second clamp plate 24 Both ends of the blade segment B along its own length direction are respectively pressed, so that the trailing edge R of the blade segment B is pressed and deformed.

Please refer to FIG. 6 and FIG. 7 together. The base 10 includes a base 11 and a fixing frame 12 fixedly connected to the base 11 . The fixing frame 12 is provided with a pair of rotating shafts 13 . The ends a are pivotally connected to the base 10 through the rotating shafts 13 respectively. Specifically, the first ends a of the first uprights 21 and the second uprights 22 are respectively provided with holes penetrating the rotating shaft 13 , and the first ends a of the first uprights 21 and the second uprights 22 are both pivoted with the base 10 through the hole-shaft fit. connect.

According to the aforementioned blade stability testing method, the driving mechanism 30 drives the clamping device 20 to apply a pressing force F to the trailing edge R of the blade segment B. As shown in FIG. The magnitude of the pressing force F can be calculated by the lever principle. As shown in Figure 7, the magnitude of the pressing force F satisfies the formula (1):

F=(F0×L1)/L2 (1)

Wherein, F0 is the driving force of the output shaft 32 of the driving mechanism 30 , L1 is the first distance between the output shaft 32 of the driving mechanism 30 and the rotating shaft 13 , and L2 is the first distance between the trailing edge R of the blade segment B and the rotating shaft 13 . Second distance.

The driving mechanism 30 may be any one of a hydraulic cylinder, an air cylinder and an electric push rod. Taking the driving mechanism 30 as a hydraulic cylinder as an example, the hydraulic cylinder is connected to the hydraulic pump station (not shown in the figure), starts the hydraulic pump, and controls the output force of the hydraulic cylinder by controlling the size of the oil pressure. The magnitude of the pressure controls the magnitude of the output force of the hydraulic cylinder, so that the hydraulic cylinder shrinks inwardly, and then the trailing edge R of the blade segment B is squeezed and deformed.

The fixing frame 12 includes a first beam 121 placed horizontally and a pair of second beams 122 arranged to intersect with the first beam 121 , and a rotating shaft 13 is disposed on the second beams 122 . Preferably, the second beam 122 is arranged perpendicular to the first beam 121 to improve the supporting force of the fixing frame 12 .

Further, the fixing frame 12 further includes a third beam 123 , one end of the third beam 123 is connected to the first beam 121 , and the other end is connected to the second beam 122 . The third beam 123 is a plate-like member, and the first beam 121 , the second beam 122 and the third beam 123 form a stable triangular structure, which further improves the supporting force of the fixing frame 12 and prevents the movement of the rotating shaft 13 from affecting the rear of the blade segment B The magnitude of the squeezing force on the edge R.

In addition, the base 11 is provided with a fixing groove 111 , and the fixing frame 12 is fixedly connected to the base 11 through a fastener placed in the fixing groove 111 . The fixing groove 111 may be an inverted T-shaped groove extending along the first direction X, the first beam 121 is laid on the base 11 along the second direction Y intersecting the first direction X, as shown in FIG. The beam 121 is provided with through holes corresponding to the inverted T-shaped grooves, the fasteners can be anchor bolts, the nuts of the anchor bolts are placed in the inverted T-shaped grooves, and the first The beam 121 is fixed with the base 11 . The anchor bolts can prevent the fixing frame 12 from moving on the base 11 . The fixing frame 12 can also be fixed on the base 11 by welding, which will not be repeated.

In order to reduce the weight of the stability test tool and improve the rigidity of the stability test tool, the first column 21, the second column 22 of the clamping device 20, and the fixing frame 12 of the base 10 can all be set with I-beams. At the same time of strength, the maximum guarantee of economy. I-beam can also be replaced by other types of steel.

While the present invention has been described with reference to the preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (12)

1. A blade stability testing method is characterized by comprising the following steps:

providing a blade section (B) to be tested, and pasting a sensing element (T) on a part to be tested of the blade section (B);

placing the blade section (B) in a clamping device (20) of a test tool along a preset direction, so that two ends of the blade section (B) along the length direction of the blade section (B) are clamped by the clamping device (20);

starting a driving mechanism (30) of the test tool to drive the clamping device (20) to apply extrusion force F to the part to be tested of the blade section (B), wherein a rotating shaft (13) is arranged at one end, opposite to the part to be tested, of the clamping device (20);

acquiring data measured by the sensing element (T).

2. The stability testing method according to claim 1, wherein the portion to be tested of the blade segment (B) is a trailing edge (R), and the predetermined direction is a direction in which a leading edge (F) of the blade segment (B) is placed downward and the trailing edge (R) is placed upward.

3. The stability test method according to claim 1 or 2, wherein the magnitude of the pressing force F satisfies formula (1):

F＝(F0×L1)/L2(1)

wherein F0 is the driving force of the output shaft of the driving mechanism, L1 is the first distance between the output shaft of the driving mechanism and the rotating shaft (13), and L2 is the second distance between the part to be measured of the blade segment (B) and the rotating shaft (13).

4. The utility model provides a blade stability test fixture which characterized in that, stability test fixture includes:

a base (10);

the clamping device (20) comprises a first upright column (21) and a second upright column (22) which are arranged oppositely, the first upright column (21) and the second upright column (22) are respectively provided with a first end (a) and a second end (b) which are opposite along the height direction, and the first ends (a) of the first upright column (21) and the second upright column (22) are rotatable relative to the base (10);

a drive mechanism (30) connected between the second end (b) of the first upright (21) and the second end (b) of the second upright (22);

the blade section (B) to be tested is placed between the first upright post (21) and the second upright post (22) along a preset direction, so that two ends of the blade section (B) along the length direction of the blade section (B) are clamped by the clamping device (20), and the clamping device (20) applies extrusion force to the part to be tested of the blade section (B) through the driving mechanism (30).

5. The stability testing tool according to claim 4, wherein the portion to be tested of the blade section (B) is a trailing edge (R) of the blade, and the predetermined direction is a direction in which a leading edge (F) of the blade section (B) is placed corresponding to the second ends (B) of the first and second uprights (21, 22) and a trailing edge (R) is placed corresponding to the first ends (a) of the first and second uprights (21, 22).

6. The stability testing tool according to claim 4, characterized in that the clamping device (20) further comprises a first clamping plate (23) and a second clamping plate (24) which are oppositely arranged, the first clamping plate (23) is fixedly connected with the first upright post (21), the second clamping plate (24) is fixedly connected with the second upright post (22), and the clamping device (20) clamps the blade segment through the first clamping plate (23) and the second clamping plate (24).

7. The stability testing tool according to claim 6, wherein a first through groove (231) is formed in the first clamping plate (23), the first through groove (231) is matched with the cross-sectional shape of the clamped end of the blade section (B), and a second through groove is formed in the second clamping plate (24) and is matched with the cross-sectional shape of the clamped end of the blade section (B).

8. The stability testing tool according to claim 4, characterized in that the clamping device (20) further comprises a pair of fixing seats (25), the pair of fixing seats (25) are fixedly connected with the second end (b) of the first upright (21) and the second end (b) of the second upright (22), respectively;

the driving mechanism (30) comprises a body part (31) and an output shaft (32) which are connected with each other, wherein one of the fixed seats (25) is connected with the body part (31), and the other fixed seat (25) is connected with the output shaft (32).

9. The stability testing tool according to claim 4, wherein the base (10) comprises a base (11) and a fixing frame (12) fixedly connected with the base (11), a pair of rotating shafts (13) are arranged on the fixing frame (12), and the first ends (a) of the first upright column (21) and the second upright column (22) are respectively pivotally connected with the base (10) through the rotating shafts (13).

10. The stability testing tool according to claim 9, wherein the fixing frame (12) comprises a first beam (121) horizontally placed and a pair of second beams (122) intersecting with the first beam (121), and the rotating shaft (13) is arranged on the second beams (122).

11. The stability testing tool according to claim 10, wherein the fixing frame (12) further comprises a third beam (123), one end of the third beam (123) is connected with the first beam (121), and the other end of the third beam is connected with the second beam (122).

12. The stability testing tool of claim 4, wherein the driving mechanism (30) is any one of a hydraulic cylinder, an air cylinder and an electric push rod.