A wind turbine generator pitch angle detection device

Abstract

The present invention relates to the technical field of wind power generation, and discloses a wind turbine pitch angle detection device, comprising: a pressure bearing mechanism, a line-laying angle measuring mechanism, a self-propelled distance control mechanism, and two sets of blade surface calibration and protection mechanisms. During detection, the transmission component of the self-propelled distance control mechanism can drive the auxiliary component to move along the surface of the blade keel to drive the distance measuring rope to move. When the blade is deformed, the deflection angle of the distance measuring rope and the rounded ruler is detected in real time by the rounded ruler. At this time, the pitch angle between the blade and the shaft head is obtained. After the detection of one of the blades is completed, the self-propelled distance control mechanism can be placed on the other blades for detection, thereby effectively improving the detection efficiency. At the same time, as the auxiliary component moves, two brush rollers will roll and brush on both sides of the blade to remove dirt accumulated on the blade.

Description

Technical Field

[0001] The invention relates to the technical field of pitch angle detection, and in particular to a pitch angle detection device for a wind turbine generator set. Background Art

[0002] The pitch angle of a wind turbine is the angle between the outermost end of the blade and the end of the wind rotor. The wind turbine uses variable pitch control to adjust the windward angle of the blade to adjust the power generation.

[0003] Currently, the pitch angle is mainly tested by pre-measurement between the pre-installed blade and the wind rotor. However, this method cannot detect the wind rotor and blade after they are erected and suspended in the air. Due to the influence of the material and length of the suspended blade, conventional detection methods are difficult to achieve.

[0004] In view of this, a wind turbine pitch angle detection device is designed to solve the above problem. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in the present invention is:

[0007] A wind turbine blade pitch angle detection device comprises: a pressure bearing mechanism, a line-laying angle measuring mechanism, a self-propelled pitch control mechanism and two sets of blade surface calibration and protection mechanisms;

[0008] The pressure-bearing mechanism comprises a protective tube, a base and a fillet ruler, wherein the protective tube is sleeved on the shaft head of the wind turbine generator set, the base is connected to the protective tube, and the fillet ruler is arranged on the base;

[0009] The line-releasing and angle-measuring mechanism comprises a winding roller and a distance-measuring rope, wherein the winding roller is rotatably connected to the base, the distance-measuring rope is wound around the winding roller, and a through hole is provided on the base for the distance-measuring rope to pass through, and the through hole is located at the center of the rounded ruler;

[0010] The self-propelled distance control mechanism includes a transmission assembly and an auxiliary assembly, the extended end of the distance measuring rope is connected to the transmission assembly, the transmission assembly is connected to the auxiliary assembly, the transmission assembly is used to drive the auxiliary assembly to move along the surface of the blade keel to drive the distance measuring rope to move, and the deflection angle between the distance measuring rope and the fillet ruler is detected in real time by the fillet ruler to obtain the pitch angle;

[0011] The propeller surface calibration protection mechanism includes two outer frames arranged on both sides of the auxiliary component, a vertical axis arranged on the inner side of the outer frame and a brush roller installed on the vertical axis. The two brush rollers are used to contact the two surfaces of the propeller to follow the movement when the auxiliary component moves, so as to clean the two surfaces of the propeller.

[0012] In some embodiments, the side wall of the protective tube is provided with three first locking bolts evenly distributed in the circumferential direction, and the first locking bolts are used to lock the protective tube on the shaft head;

[0013] The outer wall of the protective tube is provided with a guide groove, and the base is provided with a sliding block slidably connected to the guide groove;

[0014] A second locking bolt is respectively disposed at both ends of the base, and the second locking bolt is used to lock the base on the protective tube.

[0015] In some embodiments, the transmission assembly includes a housing, a motor, an end plate, an inclined plate and a baffle, the end plate is arranged on one side of the housing, one side of the inclined plate is hinged to the side of the end plate away from the housing, the baffle is connected to the bottom of the inclined plate, the housing is also provided with an end rod, the end rod is provided with a spring, the two ends of the spring are respectively pressed against the housing and the upper end of the inclined plate, and the baffle is used to lock the auxiliary assembly moved to the end of the blade; the motor is arranged in the housing, and the motor is used to drive the auxiliary assembly.

[0016] In some embodiments, the auxiliary assembly includes two shaft sleeves, two pull rods movably mounted in the two shaft sleeves, a wheel hub mounted in the middle of the two shaft sleeves, and an anti-skid tire arranged outside the wheel hub;

[0017] Two hinge supports are provided at the lower end of the housing, and the two shaft sleeves form a rotating shaft, which is rotatably connected to the hinge supports, a driven sprocket is provided on the rotating shaft, and a driving sprocket is provided on the driving shaft of the motor, and the driving sprocket and the driven sprocket are connected by a chain;

[0018] The two pull rods can rotate and move axially relative to the shaft sleeve, and the two pull rods are respectively connected to one of the outer frames.

[0019] In some embodiments, a second tension spring is respectively sleeved on both ends of the rotating shaft, and both ends of the second tension spring are respectively connected to the hinge support and the outer frame.

[0020] In some embodiments, the line-laying and angle-measuring mechanism further comprises a main clamping plate disposed on the top of the base, a secondary clamping plate disposed on the bottom of the base, and two fixing bolts disposed on the main clamping plate and the secondary clamping plate;

[0021] The winding roller is movably installed between the main clamping plate and the auxiliary clamping plate, and a torsion spring is respectively provided at the top and bottom ends of the winding roller. One end of the torsion spring away from the winding roller is fixed to the main clamping plate, and the other end of the torsion spring away from the winding roller is fixed to the auxiliary clamping plate.

[0022] In some embodiments, the top of the winding roller is provided with holes evenly distributed in the circumferential direction, a first tension spring is installed on the top of the main plate, and a positioning rod is movably installed on the main plate, the top of the first tension spring is connected to the top of the positioning rod, and the column head at the bottom of the positioning rod is adapted to be snapped into the hole in the winding roller and is used to control the length of the ranging rope after stretching.

[0023] In some embodiments, the paddle surface calibration protection mechanism also includes a support plate and an anti-slip plate installed at one end of the outer frame, and the support plate is installed on the end of the pull rod away from the hinge support, and slideways are opened in the plate surfaces at both ends of the outer frame, and sliding sleeves are arranged in the slideways, and the two sliding sleeves are respectively installed at the top and bottom ends of the vertical axis.

[0024] In some embodiments, a cross bar is movably installed on the anti-slip plate, a rectangular partition is installed on the top of the sliding sleeve, and the inner end of the cross bar is fixed on the rectangular partition, the outer sleeve of the cross bar is provided with a compression spring, and one end of the compression spring is installed on the rectangular partition, and the other end of the compression spring is installed on the anti-slip plate.

[0025] In some embodiments, an L-shaped wire through hole is provided in the base, the lead-out end of the ranging rope passes through the wire through hole, the lead-out end is provided with a foot, and the foot is connected to the self-propelled distance control mechanism.

[0026] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0027] The present invention provides a wind turbine pitch angle detection device. During detection, the transmission component can drive the auxiliary component to move along the surface of the blade keel to drive the distance measuring rope to move. When the blade is deformed, the deflection angle of the distance measuring rope and the rounded ruler is detected in real time by the rounded ruler. At this time, the pitch angle between the blade and the shaft head is obtained. After one of the blades is detected, the self-propelled distance control mechanism can be placed on the other blades for detection, thereby effectively improving the detection efficiency. At the same time, as the auxiliary component moves, two brush rollers will roll and brush on both sides of the blade to remove dirt accumulated on the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a wind turbine pitch angle detection device provided by the present invention when in use;

[0030] Figure 2 for Figure 1 A partial enlarged schematic diagram of

[0031] Figure 3 A partial dispersed schematic diagram of a wind turbine pitch angle detection device provided by the present invention;

[0032] Figure 4 is a schematic diagram of a pressure-bearing mechanism;

[0033] Figure 5 It is a schematic diagram of the laying-out angle measuring mechanism;

[0034] Figure 6 This is an enlarged schematic diagram of the footrest and ranging rope;

[0035] Figure 7 It is a schematic diagram of the self-propelled distance control mechanism and two sets of propeller surface calibration protection mechanisms;

[0036] Figure 8 It is a decentralized schematic diagram of the self-propelled distance control mechanism;

[0037] Fig. 9 It is the internal schematic diagram of the auxiliary component;

[0038] Fig.10 Schematic diagram of the protection mechanism for calibrating two sets of paddle surfaces.

[0039] Reference numerals:

[0040] 100, wind turbine generator set; 110, energy storage component; 120, shaft head;

[0041] 200, blade paddle;

[0042] 300, pressure-bearing mechanism; 310, protective tube; 320, guide groove; 330, first locking bolt; 340, base; 350, fillet ruler; 360, second locking bolt;

[0043] 400, line-paying and angle-measuring mechanism; 410, main clamping plate; 420, auxiliary clamping plate; 430, winding roller; 440, distance-measuring rope; 450, foot pad; 460, positioning rod; 470, first tension spring; 480, torsion spring; 490, fixing bolt;

[0044] 500, self-propelled distance control mechanism; 510, transmission assembly; 520, partition; 530, second tension spring; 540, auxiliary assembly; 541, wheel hub; 542, anti-skid tire; 543, shaft sleeve; 544, pull rod; 545, bearing; 546, driven sprocket; 550, end rod; 560, spring; 570, inclined plate; 580, baffle; 590, chain;

[0045] 600, paddle surface calibration protection mechanism; 610, support plate; 620, outer frame; 630, anti-slip plate; 640, vertical axis; 650, brush roller; 660, sliding sleeve; 670, cross bar; 680, compression spring. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Please refer to Figure 1-Figure 10 .

[0048] A wind turbine pitch angle detection device provided in an embodiment of the present invention comprises: a pressure bearing mechanism 300, a line-laying angle measuring mechanism 400, a self-propelled pitch control mechanism 500 and two sets of blade surface calibration protection mechanisms 600.

[0049] The wind turbine includes a wind turbine generator set 100 and three blades 200 arranged on the wind turbine generator set 100, wherein the wind turbine generator set 100 includes an energy storage component 110 and a shaft head 120 arranged on the energy storage component 110; three evenly distributed blades 200 are arranged in three ends outside the shaft head 120.

[0050] The pressure-bearing mechanism 300 includes a protective tube 310 , a base 340 and a fillet ruler 350 . The protective tube 310 is sleeved on the shaft head 120 of the wind turbine generator set 100 . The base 340 is connected to the protective tube 310 . The fillet ruler 350 is arranged on the base 340 .

[0051] The line-laying angle measuring mechanism 400 includes a winding roller 430 and a distance measuring rope 440. The winding roller 430 is rotatably connected to the base 340. The distance measuring rope 440 is wound on the winding roller 430. The base 340 is provided with a through hole for the distance measuring rope 440 to pass through. The through hole is located at the center of the rounded ruler 350. When the distance measuring rope 440 deflects, it can be detected by the rounded ruler 350. Among them, an L-shaped wire through hole is provided in the base 340. The lead-out end of the distance measuring rope 440 passes through the wire through hole. The lead-out end is provided with a pad 450, and the pad 450 is connected to the self-propelled distance control mechanism 500.

[0052] The self-propelled distance control mechanism 500 includes a transmission assembly 510 and an auxiliary assembly 540. The protruding end of the ranging rope 440 is connected to the transmission assembly 510. The transmission assembly 510 and the auxiliary assembly 540 are connected. The transmission assembly 510 can drive the auxiliary assembly 540 to move along the keel surface of the blade 200 to drive the ranging rope 440 to move. The deflection angle between the ranging rope 440 and the rounded ruler 350 is detected in real time by the rounded ruler 350 to obtain the pitch angle.

[0053] The blade surface calibration protection mechanism 600 includes two outer frames 620 arranged on both sides of the auxiliary assembly 540, a vertical shaft 640 arranged inside the outer frame 620, and a brush roller 650 installed on the vertical shaft 640, that is, the outer frame 620 plays the role of carrying the brush roller 650, and the two brush rollers 650 are in contact with the two sides of the blade 200 to follow the movement of the auxiliary assembly 540 to clean the two sides of the blade 200. In addition, the brush roller 650 also plays the role of clamping on the blade 200 to provide protection for the movement of the auxiliary assembly 540.

[0054] In the above embodiment, during the detection, the transmission component 510 can drive the auxiliary component 540 to move along the keel surface of the blade 200 to drive the distance measuring rope 440 to move. When the blade 200 is deformed, the deflection angle of the distance measuring rope 440 and the rounded ruler 350 is detected in real time by the rounded ruler 350. At this time, the pitch angle between the blade 200 and the shaft head 120 is obtained. After the detection of one of the blades 200 is completed, the self-propelled distance control mechanism 500 can be placed on the other blades 200 for detection, thereby effectively improving the detection efficiency. At the same time, as the auxiliary component 540 moves, the two brush rollers 650 will roll and brush on both sides of the blade 200 to remove the dirt accumulated on the blade 200.

[0055] In some embodiments, the side wall of the protective tube 310 is provided with three first locking bolts 330 evenly distributed in the circumferential direction. When the protective tube 310 is sleeved on the shaft head 120, the first locking bolts 330 can lock the protective tube 310 on the shaft head 120; the outer wall of the protective tube 310 is provided with a guide groove 320, and the base 340 is provided with a slider slidably connected to the guide groove 320. For example, three guide grooves 320 can be provided, and the extension direction of the guide groove 320 is parallel to the axial direction of the protective tube 310, wherein the slider is preferably a T-block to prevent the slider from detaching from the guide groove 320; a second locking bolt 360 is provided at each end of the base 340, and the second locking bolt 360 is used to lock the base 340 on the protective tube 310.

[0056] In some embodiments, the transmission assembly 510 includes a housing, a motor, an end plate, an inclined plate 570 and a baffle 580. The end plate is arranged on one side of the housing, and one side of the inclined plate 570 is hinged to the side of the end plate away from the housing. For example, a shaft rod can be arranged on the end plate, one side of the inclined plate 570 is hinged on the shaft rod, and the baffle 580 is connected to the bottom of the inclined plate 570. The housing is also provided with an end rod 550, and the end rod 550 is provided with a spring 560. The two ends of the spring 560 are respectively connected to the housing and the inclined plate. The upper end of 570 is pressed tightly, and the inclined plate 570 pressed outward by the spring 560 will fit the keel of the blade 200 for stable transverse movement, and the baffle 580 can lock the auxiliary assembly 540 moved to the end of the blade 200. When the inclined plate 570 moves out from the blade 200, the inclined plate 570 will rotate relative to the end plate under the action of the spring 560, thereby driving the baffle 580 to rotate to block the auxiliary assembly 540; the motor is arranged in the housing, and the motor is used to drive the auxiliary assembly 540. Among them, the width of the inclined plate 570 can be set according to the width of the end face of the keel of the blade 200, and after the inclined plate 570 fits the keel surface of the blade 200, the entire moving transmission assembly 510 can be protected from shaking under the protection of the two sets of blade surface calibration protection mechanisms 600 and the inclined plate 570, thereby preventing the self-propelled distance control mechanism 500 from accidentally falling after transverse movement.

[0057] In some embodiments, the auxiliary assembly 540 includes two shaft sleeves 543, two pull rods 544 movably installed in the two shaft sleeves 543, two bearings 545 fixedly installed on the two shaft sleeves 543, a hub 541 installed in the middle of the two shaft sleeves 543, and an anti-skid tire 542 arranged on the outside of the hub 541. The outside of the anti-skid tire 542 is provided with a notch to increase the friction resistance with the keel of the blade 200. When the inclined plate 570 moves to the end of the blade 200 and loses the bearing pressure, the baffle 580 will be quickly clamped in the anti-skid tire 542 under the extrusion force of the spring 560. On the groove on the outside of the slip tire 542, the locked anti-skid tire 542 will remain stationary on the keel of the propeller 200; two hinge supports are provided at the lower end of the outer shell, and two shaft sleeves 543 constitute a rotating shaft, which is rotatably connected to the hinge support, specifically connected to the hinge support through two bearings 545, and a driven sprocket 546 is provided on the rotating shaft, and a driving sprocket is provided on the driving shaft of the motor, and the driving sprocket and the driven sprocket 546 are connected by a chain 590; two pull rods 544 can rotate and move axially relative to the shaft sleeves 543, and the two pull rods 544 are respectively connected to an outer frame 620. A second tension spring 530 is respectively sleeved on both ends of the rotating shaft, and both ends of the second tension spring 530 are respectively connected to the hinge support and the outer frame 620, wherein a partition 520 can be set on the outer side of the hinge support to isolate the driven sprocket 546 and the second tension spring 530, the driven sprocket 546 is located between the partition 520 and the hinge support, and the second tension spring 530 is located on the outer side of the partition 520.

[0058] In some embodiments, the line-paying and angle-measuring mechanism 400 also includes a main plate 410 disposed on the top of the base 340, a secondary plate 420 disposed on the bottom of the base 340, and two fixing bolts 490 disposed on the main plate 410 and the secondary plate 420; the winding roller 430 is movably installed between the main plate 410 and the secondary plate 420, and a torsion spring 480 is respectively provided at the top and bottom of the winding roller 430, wherein one end of the torsion spring 480 away from the winding roller 430 is fixed to the main plate 410, and the other end of the torsion spring 480 away from the winding roller 430 is fixed to the secondary plate 420, and the length and size of the two torsion springs 480 need to be set according to the actual length of the line-paying of the ranging rope 440. The top of the winding roller 430 is provided with holes evenly distributed in the circumferential direction, the top of the main plate 410 is provided with a first tension spring 470, and a positioning rod 460 is movably installed on the main plate 410, the top of the first tension spring 470 is connected to the top of the positioning rod 460, the column head at the bottom of the positioning rod 460 is adapted to be snapped into the hole in the winding roller 430, and is used to control the length of the stretched distance measuring rope 440. Among them, the positioning rod 460 is only an implementation method for controlling the rapid positioning of the winding roller 430. According to the detection requirements, the positioning rod 460 can be remotely controlled, and a monitoring device can be set on the upward end surface of the positioning rod 460 for real-time monitoring of the rounded ruler 350 and the pitch angle of the distance measuring rope 440 to reduce the work intensity of the workers.

[0059] In some embodiments, the blade surface calibration protection mechanism 600 further includes a support plate 610 and an anti-slip plate 630 installed at one end of the outer frame 620, and the support plate 610 is installed on the end of the pull rod 544 away from the hinge support; slideways are provided in the plate surfaces at both ends of the outer frame 620, and a sliding sleeve 660 is provided in the slideway; two sliding sleeves 660 are respectively installed at the top and bottom ends of the vertical shaft 640. The two sliding sleeves 660 are movably installed in two slideways in the outer frame 620, and the vertical shaft 640 installed in the two sliding sleeves 660 can apply a balanced extrusion force to the side of the blade 200 after being compressed. At the same time, the brush roller 650 arranged outside the vertical shaft 640 can evenly roll and brush the side of the blade 200 after being compressed, so that the foreign matter adhering to the blade 200 can be brushed off, so as to reduce the corrosion of the foreign matter to the blade 200. The brush roller 650 can be made of sponge. A cross bar 670 is movably installed on the anti-slip plate 630; a rectangular partition is installed on the top of the sliding sleeve 660, and the inner end of the cross bar 670 is fixed on the rectangular partition; a compression spring 680 is sleeved on the outside of the cross bar 670, and one end of the compression spring 680 is installed on the rectangular partition, and the other end of the compression spring 680 is installed on the anti-slip plate 630.

[0060] Preferably, the length of the outer frame 620 and the brush roller 650 is twice the width of the blade 200. When the outer frame 620 is compressed and retracted toward the blade 200, the brush roller 650 arranged on the inner side of the outer frame 620 can be compressed and pressed against the two side edges of the blade 200. At this time, the brush roller 650 will adapt to the shape of the blade 200 to roll. According to the needs of foreign body cleaning, appropriate cleaning liquid can be injected into the brush roller 650. At the same time, a barrel for storing cleaning liquid is provided on the top shell of the outer frame 620, and the cleaning liquid is introduced into the brush roller 650 through a hose. By opening a hole inside the vertical shaft 640, the hose can be connected to the hole of the vertical shaft 640, and finally the cleaning liquid can be continuously immersed in the brush roller 650.

[0061] The working principle and use process of the present invention are as follows:

[0062] When the wind turbine is stopped, the staff can use climbing equipment or lifting equipment to move to the position of the wind rotor, then lift the detection device and assemble it toward the outside of the wind rotor, then adjust the three first locking bolts 330 until the protective tube 310 is clamped with the outside of the shaft head 120, and the base 340 movably installed in the guide groove 320 can be fixed to the outside of the protective tube 310 by two second locking bolts 360, and then the positioning rod 460 is stretched upward, and the winding roller 430 is in an unobstructed state;

[0063] Then, the motor in the transmission assembly 510 is started, and the driving sprocket on the driving shaft of the motor drives the chain 590. At the same time, the driven sprocket 546 drives the two combined shaft sleeves 543, the wheel hub 541 and the anti-skid tire 542 to rotate. At this time, the anti-skid tire 542 can move stably along the keel of the blade 200, and the foot pad 450 and the distance measuring rope 440 pulled by the transmission assembly 510 can move with a constant distance from the keel of the blade 200. As the distance measuring rope 440 continues to extend, once the blade 200 is deformed during operation, the distance measuring rope 440 can be skewed and measured in real time through the scale on the rounded ruler 350. At this time, the pitch angle between the blade 200 and the shaft head 120 can be measured in real time;

[0064] At the same time, the two second tension springs 530 tighten the two pull rods 544, and the two sets of paddle surface calibration protection mechanisms 600 installed at the outer ends of the two pull rods 544 can be pressed against the two side surfaces of the blade 200. At this time, the two extended brush rollers 650 will be compressed and pressed against the two sides of the blade 200. With the stable movement of the auxiliary component 540, the two brush rollers 650 can provide anti-drop protection for the movement of the auxiliary component 540. At the same time, the two brush rollers 650 squeezed by the two sets of compression springs 680 can move stably along with the lateral movement of the anti-skid tire 542. At this time, the two brush rollers 650 that are pressurized and rotated can also roll and brush the dirt accumulated on both sides of the blade 200.

[0065] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above is a detailed introduction to a wind turbine pitch angle detection device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A wind turbine pitch angle detection device, characterized in that: include: A pressure bearing mechanism (300), a line-laying and angle-measuring mechanism (400), a self-propelled distance-controlling mechanism (500), and two sets of propeller surface calibration and protection mechanisms (600); The pressure-bearing mechanism (300) comprises a protective tube (310), a base (340) and a fillet ruler (350); the protective tube (310) is sleeved on the shaft head (120) of the wind turbine generator set (100); the base (340) is connected to the protective tube (310); and the fillet ruler (350) is arranged on the base (340); The line-laying and angle-measuring mechanism (400) comprises a winding roller (430) and a distance-measuring rope (440), wherein the winding roller (430) is rotatably connected to the base (340), the distance-measuring rope (440) is wound around the winding roller (430), and the base (340) is provided with a through hole for the distance-measuring rope (440) to pass through, and the through hole is located at the center of the rounded ruler (350); The self-propelled distance control mechanism (500) comprises a transmission assembly (510) and an auxiliary assembly (540); the extended end of the distance measuring rope (440) is connected to the transmission assembly (510); the transmission assembly (510) and the auxiliary assembly (540) are connected; the transmission assembly (510) is used to drive the auxiliary assembly (540) to move along the keel surface of the blade (200) so as to drive the distance measuring rope (440) to move; the deflection angle between the distance measuring rope (440) and the fillet ruler (350) is detected in real time by the fillet ruler (350) so as to obtain the pitch angle; The paddle surface calibration protection mechanism (600) comprises two outer frames (620) arranged on both sides of the auxiliary component (540), a vertical shaft (640) arranged on the inner side of the outer frame (620), and a brush roller (650) installed on the vertical shaft (640), wherein the two brush rollers (650) are used to contact the two sides of the blade (200) so as to follow the movement of the auxiliary component (540) to clean the two sides of the blade (200).

2. A wind turbine pitch angle detection device according to claim 1, characterized in that: The side wall of the protective tube (310) is provided with three first locking bolts (330) evenly distributed in a circumferential direction, and the first locking bolts (330) are used to lock the protective tube (310) on the shaft head (120); The outer wall of the protective tube (310) is provided with a guide groove (320), and the base (340) is provided with a sliding block slidably connected to the guide groove (320); A second locking bolt (360) is respectively provided at both ends of the base (340), and the second locking bolt (360) is used to lock the base (340) on the protective tube (310).

3. A wind turbine pitch angle detection device according to claim 2, characterized in that: The transmission assembly (510) comprises a housing, a motor, an end plate, an inclined plate (570) and a baffle (580); the end plate is arranged on one side of the housing; one side of the inclined plate (570) is hinged to a side of the end plate away from the housing; the baffle (580) is connected to the bottom of the inclined plate (570); an end rod (550) is further arranged on the housing; a spring (560) is sleeved on the end rod (550); two ends of the spring (560) are respectively pressed against the housing and the upper end of the inclined plate (570); the baffle (580) is used to lock the auxiliary assembly (540) moved to the end of the blade (200); the motor is arranged in the housing; the motor is used to drive the auxiliary assembly (540).

4. A wind turbine pitch angle detection device according to claim 3, characterized in that: The auxiliary assembly (540) comprises two shaft sleeves (543), two pull rods (544) movably mounted in the two shaft sleeves (543), a wheel hub (541) mounted in the middle of the two shaft sleeves (543), and an anti-skid tire (542) arranged outside the wheel hub (541); Two hinge supports are provided at the lower end of the housing, the two shaft sleeves (543) form a rotating shaft, the rotating shaft is rotatably connected to the hinge supports, a driven sprocket (546) is provided on the rotating shaft, a driving sprocket is provided on the drive shaft of the motor, and the driving sprocket and the driven sprocket (546) are connected via a chain (590); The two pull rods (544) can rotate and move axially relative to the shaft sleeve (543), and the two pull rods (544) are respectively connected to one of the outer frames (620).

5. A wind turbine pitch angle detection device according to claim 4, characterized in that: A second tension spring (530) is respectively sleeved on both ends of the rotating shaft, and both ends of the second tension spring (530) are respectively connected to the hinge support and the outer frame (620), and the two brush rollers (650) are clamped on the blade (200) under the action of the two second tension springs (530).

6. A wind turbine pitch angle detection device according to claim 1, characterized in that: The line-laying and angle-measuring mechanism (400) further comprises a main clamping plate (410) arranged on the top of the base (340), a secondary clamping plate (420) arranged on the bottom of the base (340), and two fixing bolts (490) arranged on the main clamping plate (410) and the secondary clamping plate (420); The winding roller (430) is movably installed between the main clamping plate (410) and the auxiliary clamping plate (420), and a torsion spring (480) is respectively provided at the top and bottom ends of the winding roller (430), wherein one end of the torsion spring (480) away from the winding roller (430) is fixed to the main clamping plate (410), and the other end of the torsion spring (480) away from the winding roller (430) is fixed to the auxiliary clamping plate (420).

7. A wind turbine pitch angle detection device according to claim 6, characterized in that: The top of the winding roller (430) is provided with holes evenly distributed in the circumferential direction, the top of the main plate (410) is installed with a first tension spring (470), and a positioning rod (460) is movably installed on the main plate (410), the top of the first tension spring (470) is connected to the top of the positioning rod (460), and the column head at the bottom of the positioning rod (460) is selectively adapted to be snapped into one of the holes on the winding roller (430), and is used to control the length of the distance measuring rope (440) after stretching.

8. A wind turbine pitch angle detection device according to claim 4, characterized in that: The paddle surface calibration protection mechanism (600) further includes a support plate (610) and an anti-slip plate (630) installed at one end of the outer frame (620), and the support plate (610) is installed on the end of the pull rod (544) away from the hinge support. Slideways are provided in the plate surfaces at both ends of the outer frame (620), and sliding sleeves (660) are provided in the slideways. The two sliding sleeves (660) are respectively installed at the top and bottom ends of the vertical shaft (640).

9. A wind turbine pitch angle detection device according to claim 8, characterized in that: A cross bar (670) is movably mounted on the anti-slip plate (630), a rectangular partition is mounted on the top of the sliding sleeve (660), and the inner end of the cross bar (670) is fixed on the rectangular partition, a compression spring (680) is sleeved on the outside of the cross bar (670), and one end of the compression spring (680) is mounted on the rectangular partition, and the other end of the compression spring (680) is mounted on the anti-slip plate (630).

10. A wind turbine pitch angle detection device according to claim 1, characterized in that: An L-shaped wire through hole is provided in the base (340), and the lead-out end of the distance measuring rope (440) passes through the wire through hole. The lead-out end is provided with a pad foot (450), and the pad foot (450) is connected to the self-propelled distance control mechanism (500).

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