CN114562428A - A wind turbine load measuring device - Google Patents

Abstract

The invention discloses a wind turbine load measuring device, comprising a cantilever rod and a longitudinal displacement detection head arranged in the length direction of the cantilever rod. The fixed end of the cantilever rod is set on the cantilever mounting seat, and the suspended end is provided with a longitudinal reference The longitudinal displacement detection head is fixed on the detection head mounting seat and a measurement gap is set between the detection end and the longitudinal reference plane on the cantilever rod, and the cantilever mounting seat and the detection head mounting seat are both fixed on the wind power On the load detection surface of the unit, an installation and positioning device is also arranged between the cantilever mounting seat and the detection head mounting seat. The wind turbine load measuring device of the invention has the advantages of simple installation, convenient maintenance and high measurement result accuracy, can greatly improve the safety and reliability of the wind turbine operation, and has high practical value.

Description

A wind turbine load measuring device

technical field

The invention relates to the technical field of wind turbine mechanical load measurement, in particular to a wind turbine load measurement device.

Background technique

Under the continuous alternating load, if the load on the tower or blade of the wind turbine exceeds its corresponding fatigue limit, fatigue failure will occur, and then breakage will occur. Therefore, the wind turbine load test is an important part of the development of the wind turbine. Its importance is reflected in two aspects: firstly, it can improve the reliability of the whole life cycle operation of the unit, and secondly, it can optimize the design of the unit through the implementation of digital testing, further reduce the development cost of the unit, and provide technical support for complex terrain applications. According to the standard GB/T 37257 - 2018/IEC 61400 - 13:2015, the wind turbine load test items mainly include tower load and blade load measurement. Usually, strain gauges are installed in the middle of the tower, the top of the tower, the root of the blade, etc., and the whole bridge is assembled to collect the load signal, and the strain of the test area is measured.

The advantages and disadvantages of using strain gauges to measure the load of wind turbines coexist. However, the disadvantages are also very obvious. The main disadvantages are: 1. The installation is cumbersome. The installation of a set of strain gauges involves many links such as point selection, grinding, scribing, pasting, and welding. A little carelessness in the above links will have a certain impact on the load measurement results. 2. Maintenance is not easy. After the strain gauge is installed, it is usually covered with moisture-proof glue, fireproof mud and tin foil tape in sequence. If the strain gauge needs to be replaced later, all coverings on its surface need to be removed, which is a time-consuming and labor-intensive process. 3. The strain measurement area of the strain gauge measuring point is small, and it cannot be ensured that the measurement area has a corresponding deformation when it is loaded, and there is a certain uncertainty, which will cause deviations in the measurement results. The publication date is December 25, 2020, and the Chinese patent document with publication number CN212228366U discloses a wind turbine load testing device; including control equipment, an uninterruptible power supply, three sets of first strain gauges, three sets of second strain gauges and Three sets of third strain gauges, the control device and the uninterruptible power supply are installed on the hub, and each set of the first strain gauges is respectively installed at the bottom of the outer sidewall of the blade, the middle of the outer sidewall of the blade and the top of the outer sidewall of the blade. The second strain gauges are respectively installed at the bottom of the inner sidewall of the blade, the middle of the inner sidewall of the blade and the top of the inner sidewall of the blade. By setting the first strain gage, the second strain gage and the third strain gage, the device can monitor the load state of the blade in real time, give an early warning to the fault symptoms before the occurrence of a major accident, and guide the inspectors to replace and repair the blade, so as to avoid The occurrence of a catastrophic failure. However, this device uses strain gauges to measure the load of the wind turbine, which is complicated in installation, difficult to maintain, and has a small strain measurement area at the strain gauge measuring point. Bias problem.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems in the prior art wind turbine load measuring device that the installation is cumbersome, the maintenance is difficult, and the strain measurement area of the strain gauge measuring point is small, and the measurement area cannot be guaranteed to produce equivalent deformation when under load, so that the measurement results are generated. To solve the problem of large deviation, a wind turbine load measurement device is provided, which has the advantages of simple installation, convenient maintenance and high measurement result accuracy.

The technical solution adopted by the present invention to solve the above technical problems is that a wind turbine load measurement device includes a cantilever rod and a longitudinal displacement detection head arranged in the length direction of the cantilever rod, and the fixed end of the cantilever rod is set on the cantilever rod. On the mounting seat, the suspended end of the cantilever rod is provided with a longitudinal reference plane, the longitudinal displacement detection head is fixed on the detection head mounting seat, the longitudinal displacement detection head is close to the suspended end of the cantilever rod, and the detection end of the longitudinal displacement detection head is connected to the cantilever. There is a measurement gap between the longitudinal reference planes on the rod, the cantilever mounting seat and the detection head mounting seat are fixed on the load detection surface of the wind turbine, and the cantilever rod and the load detection surface are parallel. An installation and positioning device is also arranged between the cantilever mounting seat and the detection head mounting seat.

The wind turbine load measuring device of the present invention comprises a longitudinal displacement detection head and a cantilever rod, the longitudinal displacement detection head is fixed on the detection head mounting seat, the fixed end of the cantilever rod is fixed on the cantilever mounting seat, the detection head mounting seat and the cantilever mounting seat are both It is installed on the load detection surface (usually in the middle of the tower, the top of the tower, the root of the blade, etc.) that needs to be measured. The cantilever rod is set horizontally and is located on the same axis as the longitudinal displacement detection head. The detection end of the longitudinal displacement detection head is connected to the cantilever. There is a small measuring gap between the suspended ends of the rod.

The measurement principle of the present invention is to convert the strain measurement into displacement measurement, so that the measurement precision is greatly improved, and the measurement result is more accurate and reliable. When measuring, install the load measuring device on the inner wall (load detection surface), and set the original distance from the fixed end of the cantilever rod (the end connected to the cantilever mounting base) to the end of the longitudinal displacement detection head with the signal line as L, and the longitudinal displacement There is a small gap between the detection end of the detection head and the longitudinal reference plane on the cantilever rod, denoted as l. When the load detection surface is deformed by the alternating load, the size of the small gap l changes, then △l/L is It reflects the size of the strain generated when the installation area of the load measuring device is loaded. Since the load measuring device of the present invention introduces a cantilever rod system with a long span, compared with the strain gauge, the span of the measuring area is large, so the uncertainty of the deformation of the measuring area in the prior art can be minimized. impact, thereby greatly improving the accuracy of the measurement. Considering the fact that the detection head mount and cantilever mount are fixed to the load detection surface, it may affect the strain of the load detection surface under load (that is, the deformation of the load detection surface fixed by the detection head mount and the cantilever mount may correspond accordingly. decrease), so the original distance L here can be corrected according to the actual situation to improve the accuracy of the measurement. In addition, in terms of installation and maintenance, the load measuring device of the present invention has a simple structure and is easy to install. It is only necessary to fix the detection head mounting seat and the cantilever mounting seat on the load detection surface (blade or inner wall of the tower). In addition, if the load measuring device needs to be detected, calibrated or replaced in the future, it is only necessary to remove the entire longitudinal displacement detection head part, and other components can be kept unchanged. In this way, the present invention solves the problems of complicated installation, difficult maintenance and large deviation of measurement results in the prior art wind turbine load measurement device, and has the advantages of simple installation, convenient maintenance and high measurement result accuracy.

Preferably, the installation and positioning device includes lifting ears and positioning rods symmetrically arranged on the left and right sides of the cantilever mounting seat and the detection head mounting seat, the lifting ears are provided with positioning holes, and the positioning rods are penetrated in the positioning holes , the positioning rods on both sides are parallel to the cantilever rod and on the same plane as the cantilever rod, and the lifting lug is also provided with a set screw for fixing the positioning rod; the longitudinal displacement detection head is provided with a photoelectric distance measuring module and a temperature measurement module. The installation positioning device can ensure the relative position between the cantilever mounting base and the detection head mounting base is accurate, so as to minimize the installation error during installation, thereby improving the measurement accuracy. When the load measuring device is installed, the positioning rod is inserted into the lifting lug on the detection head mounting base and the cantilever mounting base and fixed by the set screw, so as to limit the freedom of movement of the two and avoid the longitudinal displacement of the detection head and the cantilever rod during the installation process. The two axes are inclined and misaligned in the horizontal or vertical direction. After the load measuring device is installed, the two positioning rods are removed to avoid affecting the displacement measurement.

The longitudinal displacement detection head of this solution adopts a photoelectric distance measuring module and is equipped with a temperature measurement module. During the measurement, the photoelectric distance measurement module emits infrared rays and senses the infrared rays reflected from the longitudinal reference plane on the cantilever rod. The temperature is measured directly. When the load detection surface is deformed by the alternating load, the size of the tiny gap l changes. At the same time, the infrared light intensity reflected by the induction on the longitudinal displacement detection head also changes, and the light intensity change signal is transmitted to the single-chip microcomputer inside the load measuring device through the signal line. The temperature and the thermal expansion coefficient of the cantilever rod material are converted into the real displacement change △l, and finally the strain generated when the installation area of the load measuring device is loaded is calculated by the △l/L through the microcontroller, which can further improve the measurement accuracy.

Preferably, the detection head mounting base includes a bottom plate and a detection head mounting plate vertically arranged on the bottom plate, the lifting ears are arranged at the left and right ends of the detection head mounting plate, and the detection head mounting plate is provided with screw holes The longitudinal displacement detection head is screwed on the detection head mounting plate, a fastening nut is arranged between the longitudinal displacement detection head and the detection head mounting plate, and the bottom surfaces of the detection head mounting seat and the cantilever mounting seat are provided with multiple groups of trapezoids The groove, the detection head mounting seat and the cantilever mounting seat are all glued to the load detection surface of the wind turbine. The detection head mounting seat and cantilever mounting seat of this scheme are both bonded to the load detection surface of the wind turbine through glue, which can facilitate the installation and maintenance (removal) of the load measurement device. When bonding, use the installation positioning device to install the detection head. The position of the seat and the cantilever mounting seat is fixed, which can ensure the installation accuracy.

Preferably, the cantilever rod is a cylinder and adopts a chrome alloy material with a low thermal expansion coefficient, one end of the cantilever rod is provided with a thread, and the cantilever mounting seat is provided with a screw hole, and the cantilever rod is screwed with the cantilever mounting seat, The longitudinal reference plane arranged on the suspended end of the cantilever rod is circular, the diameter of the longitudinal reference plane is larger than the diameter of the cantilever rod, and the longitudinal reference plane is a plane. The cantilever rod is made of chrome alloy material with low thermal expansion coefficient, which can reduce the measurement error caused by the thermal expansion and contraction of the cantilever rod.

As another preferred solution, the load measuring device further includes a lateral displacement detection head and a vertical displacement detection head, the detection head mounting seat is a horizontal rectangular box-shaped body, and the suspended end of the cantilever rod is located in the In the box-shaped body, the bottom of the box-shaped body and the two adjacent side walls are provided with screw holes, and the longitudinal displacement detection head is screwed on the box bottom of the box-shaped body. The displacement detection heads are respectively screwed on the adjacent two side walls of the box-shaped body, fastening nuts are provided between the detection head and the detection head mounting seat, and the suspended end of the cantilever rod is also provided with a lateral displacement detection The horizontal reference plane corresponding to the head and the vertical reference plane corresponding to the vertical displacement detection head are provided between the detection end of the lateral displacement detection head and the horizontal reference plane, and the detection end of the vertical displacement detection head and the vertical reference plane. gap. In addition to the longitudinal (X-direction) displacement detection in the previous scheme, this scheme also detects the lateral (Y-direction) and vertical (Z-direction) displacements of the suspended end of the cantilever rod, so that according to the displacement data in the three directions, Make a more detailed and accurate judgment on the deformation of the measured area and take corresponding countermeasures, thereby improving the safety and reliability of the wind turbine operation.

Preferably, the cantilever rod is a cylinder and adopts a chrome alloy material with a low thermal expansion coefficient, one end of the cantilever rod is provided with a thread, and the cantilever mounting seat is provided with a screw hole, and the cantilever rod is screwed with the cantilever mounting seat, The suspended end of the cantilever rod is provided with a rectangular block, and the end face of the rectangular block constitutes a longitudinal reference plane corresponding to the longitudinal displacement detection head; the side surface of the rectangular block constitutes a lateral reference plane corresponding to the lateral displacement detection head and the vertical displacement detection head. The vertical reference plane; the longitudinal reference plane, the horizontal reference plane and the vertical reference plane are all planes; the lateral displacement detection head and the vertical displacement detection head are all provided with photoelectric ranging modules. In this scheme, a cube block structure is placed at the suspended end of the cantilever rod, and three mutually perpendicular planes of the cube are used as the corresponding reference planes to complete the displacement detection in three directions.

Preferably, the lifting lugs are arranged on the left and right side walls of the detection head mounting seat, the side walls of the detection head mounting seat opposite to the load detection surface are provided with a plurality of sets of trapezoidal grooves, and the detection head mounting seat is bonded to the wind turbine by glue. load detection surface.

Preferably, the wind turbine load measuring device further includes a protective casing, a casing mounting seat is provided on the load detection surface, a screw rod is fixed on the casing mounting seat, and the protective casing is fixed on the load detection surface by the screw rod The protective casing is provided with a cable hole for passing the signal wire of the detection head. The protective shell plays the role of covering and protecting the displacement detection head and the reference surface inside the protective shell, and the protective shell is fixed by the shell mounting seat installed on the load detection surface.

Preferably, the housing mounting seat is in the shape of a long strip and is symmetrically arranged on the load detection surfaces on both sides of the cantilever rod. The housing mounting seat is a stretchable elastic structure, and the housing mounting seat passes through the glue and the load detection surface. bonding. The elastic structure of the shell mounting seat can avoid affecting the deformation of the load detection surface. For example, rubber and a screw preset in the rubber are used to form the fixing mechanism of the protective shell, and the protective shell can be made of high-strength engineering plastics.

The beneficial effects of the present invention are: it effectively solves the problems of the prior art wind turbine load measuring device that is cumbersome to install, difficult to maintain, and the strain gauge measuring point strain measuring area is small, and the measuring area cannot be guaranteed to produce equivalent deformation when under load. Therefore, the problem of large deviation in the measurement results occurs. The wind turbine load measurement device of the present invention has the advantages of simple installation, convenient maintenance and high measurement result accuracy, which can greatly improve the safety and reliability of the operation of the wind turbine, and has a high practical value.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the interior of Embodiment 1 of the wind turbine load measuring device according to the present invention;

2 is a front view of an internal structure of Embodiment 1 of the present invention;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is the left side view of Fig. 2;

Fig. 5 is the right side view of Fig. 2;

Fig. 6 is a kind of outline three-dimensional structure schematic diagram of Embodiment 1 of the present invention;

7 is a schematic diagram of a three-dimensional exploded structure of Embodiment 2 of the present invention.

In the picture: 1. Cantilever rod, 2. Longitudinal displacement detection head, 3. Cantilever mounting seat, 4. Longitudinal reference plane, 5. Detection head mounting seat, 6. Load detection surface, 7. Lifting lug, 8. Positioning rod, 9. Set screw, 10. Fastening nut, 11. Trapezoidal groove, 12. Lateral displacement detection head, 13. Vertical displacement detection head, 14. Lateral reference plane, 15. Vertical reference plane, 16. Protective shell , 17. Housing mount, 18. Screw, 19. Signal line.

Detailed ways

The specific implementations of the technical solutions of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

Example 1

In Embodiment 1 shown in FIGS. 1 , 2 and 3 , a wind turbine load measurement device includes a cantilever rod 1 and a longitudinal displacement detection head 2 arranged in the length direction of the cantilever rod. The cantilever rod is fixed The end is arranged on the cantilever mounting seat 3, the cantilever rod is a cylinder and adopts a chrome alloy material with a low thermal expansion coefficient, one end of the cantilever rod is provided with a thread, and the cantilever mounting seat is provided with a screw hole, and the cantilever rod is connected with the cantilever rod. The cantilever mounting seat is screwed, and the suspended end of the cantilever rod is provided with a longitudinal reference plane 4 (see Figure 1). The longitudinal reference plane is circular, and the diameter of the longitudinal reference plane is larger than the diameter of the cantilever rod. The longitudinal displacement detection head is fixed on the detection head mounting base 5, and the detection head mounting base includes a bottom plate and a detection head mounting plate vertically arranged on the bottom plate, and the lifting ears are arranged at the left and right ends of the detection head mounting plate , the detection head mounting plate is provided with screw holes, the longitudinal displacement detection head is screwed on the detection head mounting plate, a fastening nut 10 is arranged between the longitudinal displacement detection head and the detection head mounting plate, and the detection head The bottom surfaces of the mounting seat and the cantilever mounting seat are provided with multiple sets of trapezoidal grooves 11 , and the detection head mounting seat and the cantilever mounting seat are both bonded to the load detection surface of the wind turbine through glue. The longitudinal displacement detection head is close to the suspended end of the cantilever rod, and there is a measurement gap between the detection end of the longitudinal displacement detection head and the longitudinal reference plane on the cantilever rod. The cantilever mounting seat and the detection head mounting seat are fixed on the wind turbine. On the load detection surface 6 and the cantilever rod is parallel to the load detection surface, an installation and positioning device is also arranged between the cantilever mounting seat and the detection head mounting seat. The lifting lugs 7 and the positioning rods 8 on the left and right sides of the head mounting seat (see Figure 4 and Figure 5), the lifting lugs are provided with positioning holes, the positioning rods are penetrated in the positioning holes, and the positioning rods on both sides Parallel to the cantilever rod and on the same plane as the cantilever rod, the lifting lug is also provided with a set screw 9 for fixing the positioning rod; the longitudinal displacement detection head is provided with a photoelectric distance measuring module and a temperature measuring module.

The wind turbine load measuring device in this embodiment further includes a protective casing 17 (see FIG. 6 ), a casing mounting seat 18 is provided on the load detection surface, and a screw rod 19 is fixed on the casing mounting seat. The casing is fixed on the load detection surface by screws, and the protective casing is provided with a cable hole for passing the signal wire 20 of the detection head. The housing mounting seat is in the shape of a long strip and is symmetrically arranged on the load detection surfaces on both sides of the cantilever rod. The housing mounting seat is a stretchable elastic structure (rubber is used in this embodiment), and the housing mounting seat is made of glue. Bonded to the load detection surface.

Example 2

In Embodiment 2 as shown in FIG. 7 , the load measuring device further includes a lateral displacement detection head 12 and a vertical displacement detection head 13, the detection head mounting seat is a horizontal rectangular box-shaped body, and the cantilever rod The suspended end of the box-shaped body is located in the box-shaped body, the bottom of the box-shaped body and the two adjacent side walls are provided with screw holes, and the longitudinal displacement detection head is screwed on the box bottom of the box-shaped body. The lateral displacement detection head and the vertical displacement detection head are respectively screwed on the adjacent two side walls of the box-shaped body, fastening nuts are provided between the detection head and the detection head mounting seat, and the suspended end of the cantilever rod There is also a lateral reference plane 14 corresponding to the lateral displacement detection head and a vertical reference plane 15 corresponding to the vertical displacement detection head. There are measurement gaps between the vertical reference planes. The cantilever rod is a cylinder and adopts a chrome alloy material with a low thermal expansion coefficient. One end of the cantilever rod is provided with a thread, and the cantilever mounting seat is provided with a screw hole. The cantilever rod is screwed with the cantilever mounting seat. The suspended end is provided with a rectangular block 16, and the end face of the rectangular block constitutes a longitudinal reference plane corresponding to the longitudinal displacement detection head; The reference plane; the longitudinal reference plane, the transverse reference plane and the vertical reference plane are all planes; the lateral displacement detection head and the vertical displacement detection head are all provided with photoelectric ranging modules. The lifting lugs are arranged on the left and right side walls of the detection head mounting seat. The side walls of the detection head mounting seat opposite to the load detection surface are provided with multiple groups of trapezoidal grooves. The detection head mounting seat is bonded to the load detection surface of the wind turbine by glue. The rest are the same as in Example 1.

When the load measuring device of the present invention is installed, first insert the positioning rod into the lifting lugs of the detection head mounting base and the cantilever mounting base and fix them with set screws, so as to limit the freedom of movement of the two and prevent the longitudinal displacement detection head and the cantilever rod from being installed. During the process, the axes of the two are inclined and misaligned in the horizontal or vertical direction. After the internal structure of the load measuring device is installed, the two positioning rods need to be removed before installing the protective shell.

Before installing the load measuring device, first determine the test area (load detection surface) on the inner wall to be tested and make a frame selection with a marker, and then paste the housing mounting seat with the screw in this area. Then install the load measuring device in the area selected by the box between the two housing mounts. First screw the longitudinal displacement detection head into the detection head mounting base and tighten the lock nut, then insert the positioning rod into the lifting ears on both sides of the detection head mounting base, and then tighten the set screws on the lifting ears to ensure that the positioning rod will not be in the lifting ears. Slip occurs. The detector head mount is glued to the test area. Because of the trapezoidal groove at the bottom, the contact area between the detector head mount and the glue is increased, so that the detector head mount can be stably and reliably installed on the inner wall. Then screw the cantilever rod into the cantilever mounting seat, connect the cantilever mounting seat sleeve to the positioning rod through the lifting ears on both sides of the cantilever mounting seat, move the cantilever mounting seat and ensure that one end of the cantilever rod enters the detection range of the longitudinal displacement detection head. The original distance from the end of the cantilever rod screwed into the mounting seat to the end of the longitudinal displacement detection head with the signal line is L. Finally, glue the cantilever mounting seat to the test area.

After the above steps are completed and the glue is cured, the positioning rod is removed, and the protective casing is installed on the casing mounting seat to complete the overall installation of the load measuring device.

The photoelectric ranging module in the longitudinal displacement detection head emits infrared rays, and senses the infrared rays reflected from the longitudinal reference plane on the cantilever rod. When the inner wall is deformed by the alternating load, the small gap between the cantilever rod and the longitudinal displacement detection head changes. At the same time, the infrared light intensity reflected by the longitudinal displacement detection head also changes, and the light intensity change signal is transmitted to the single-chip microcomputer inside the load measuring device through the signal line. The coefficient converts the real displacement change amount Δl, and finally calculates the strain size generated when the installation area of the load measuring device is loaded according to Δl/L by the single-chip microcomputer. The working principles of the lateral displacement detection head and the vertical displacement detection head are similar to those of the longitudinal displacement detection head, which should be mastered by those skilled in the art, and will not be described in detail here.

In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features or technical data of the present invention can be re-selected and combined to form new embodiments, which are not required by those skilled in the art. It can be achieved by performing creative work, so these embodiments of the present invention that are not described in detail should also be regarded as specific embodiments of the present invention and fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides a wind turbine generator system load measuring device, its characterized in that includes a cantilever bar (1) and sets up longitudinal displacement detection head (2) on cantilever bar length direction, the stiff end setting of cantilever bar is on cantilever mount pad (3), and the free end of cantilever bar is equipped with longitudinal reference surface (4), longitudinal displacement detection head fix on detecting first mount pad (5), be equipped with between the longitudinal reference surface on the free end that longitudinal displacement detection head is close to cantilever bar and the detection end of longitudinal displacement detection head and the cantilever bar and measure the clearance, cantilever mount pad and detection head mount pad all fix on wind turbine generator system's load detection face (6) just cantilever bar and load detection personally submit parallel form, cantilever mount pad and detection head mount pad between still be equipped with installation positioner.

2. The wind turbine generator load measuring device according to claim 1, wherein the mounting and positioning device comprises lifting lugs (7) and positioning rods (8) which are symmetrically arranged on the left side and the right side of the cantilever mounting seat and the detection head mounting seat, positioning holes are formed in the lifting lugs, the positioning rods penetrate through the positioning holes, the positioning rods on the two sides are parallel to the cantilever rods and are on the same plane with the cantilever rods, and fastening screws (9) used for fixing the positioning rods are further arranged on the lifting lugs; and a photoelectric distance measuring module and a temperature measuring module are arranged in the longitudinal displacement detecting head.

3. The wind turbine generator load measuring device according to claim 2, wherein the detection head mounting seat comprises a bottom plate and a detection head mounting plate vertically arranged on the bottom plate, the lifting lugs are arranged at the left end and the right end of the detection head mounting plate, screw holes are formed in the detection head mounting plate, the longitudinal displacement detection head is screwed on the detection head mounting plate, fastening nuts (10) are arranged between the longitudinal displacement detection head and the detection head mounting plate, a plurality of groups of trapezoidal grooves (11) are formed in the bottom surfaces of the detection head mounting seat and the cantilever mounting seat, and the detection head mounting seat and the cantilever mounting seat are bonded on a load detection surface of the wind turbine generator through glue.

4. The wind turbine generator load measuring device according to claim 3, wherein the cantilever bar is a cylinder and is made of a chromium alloy material with a low thermal expansion coefficient, one end of the cantilever bar is provided with a thread, the cantilever mounting seat is provided with a screw hole, the cantilever bar is in threaded connection with the cantilever mounting seat, a longitudinal reference surface arranged at a free end of the cantilever bar is circular, the diameter of the longitudinal reference surface is larger than that of the cantilever bar, and the longitudinal reference surface is a plane.

5. The wind turbine generator load measuring device according to claim 1, wherein the load measuring device further comprises a transverse displacement detecting head (12) and a vertical displacement detecting head (13), the detecting head mounting seat is a transverse rectangular box-shaped body, the free end of the cantilever rod is located in the box-shaped body, the bottom and two adjacent side walls of the box-shaped body are respectively provided with a screw hole, the longitudinal displacement detecting head is screwed on the box bottom of the box-shaped body, the transverse displacement detecting head and the vertical displacement detecting head are respectively screwed on the two adjacent side walls of the box-shaped body, a fastening nut is arranged between the detecting head and the detecting head mounting seat, the free end of the cantilever rod is further provided with a transverse reference surface (14) corresponding to the transverse displacement detecting head and a vertical reference surface (15) corresponding to the vertical displacement detecting head, and the detecting end of the transverse displacement detecting head and the transverse reference surface, And measuring gaps are arranged between the detecting end of the vertical displacement detecting head and the vertical reference surface.

6. The wind turbine generator load measuring device according to claim 5, wherein the cantilever rod is a cylinder and made of a chromium alloy material with a low thermal expansion coefficient, one end of the cantilever rod is provided with a thread, the cantilever mounting seat is provided with a screw hole, the cantilever rod is in threaded connection with the cantilever mounting seat, the free end of the cantilever rod is provided with a rectangular block, and the end surface of the rectangular block forms a longitudinal reference surface corresponding to the longitudinal displacement detection head; the side surfaces of the rectangular blocks form a transverse reference surface and a vertical reference surface which correspond to the transverse displacement detection head and the vertical displacement detection head; the longitudinal reference surface, the transverse reference surface and the vertical reference surface are all planes; and photoelectric distance measuring modules are arranged in the transverse displacement detection head and the vertical displacement detection head.

7. The wind turbine generator load measuring device according to claim 5, wherein the lifting lugs are arranged on the left side wall and the right side wall of the detection head mounting seat, a plurality of groups of trapezoidal grooves are arranged on the side wall of the detection head mounting seat opposite to the load detection surface, and the detection head mounting seat is bonded on the load detection surface of the wind turbine generator through glue.

8. The wind turbine generator load measuring device according to any one of claims 1 to 7, further comprising a protective shell (16), wherein a shell mounting seat (17) is arranged on the load detection surface, a screw (18) is fixed on the shell mounting seat, the protective shell is fixed on the load detection surface through the screw, and a cable hole for passing a detection head signal line (19) is formed in the protective shell.

9. The wind turbine generator load measuring device according to claim 8, wherein the housing mounting base is elongated and symmetrically disposed on the load detecting surface at both sides of the cantilever bar, the housing mounting base is of a stretchable elastic structure, and the housing mounting base is adhered to the load detecting surface by glue.

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