CN112505355A

CN112505355A - Wind vane alignment device and alignment method for wind driven generator

Info

Publication number: CN112505355A
Application number: CN202011507794.2A
Authority: CN
Inventors: 王文鹤; 柴有琢; 孙广超; 李宏斌; 郑贺
Original assignee: Beijing Tanghao Power Engineering Technology Research Co ltd
Current assignee: Beijing Tanghao Power Engineering Technology Research Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-03-16

Abstract

The invention relates to a wind vane alignment device of a wind driven generator and an alignment method thereof. The alignment method comprises the following steps: setting a plurality of reference points; placing an internal laser demarcation device and a plumb scale according to the datum point; determining the calibration positions of the cylindrical magnet blocks inside the cabin cover, and determining two calibration straight lines outside the cabin cover through the cylindrical magnet blocks inside and outside the cabin cover; placing a laser demarcation device outside the cover according to the two calibration straight lines; and finally, adjusting the wind vane. The invention can enable the zero position of the mounted wind vane to more accurately face the front of the wind driven generator, thereby accurately controlling the wind facing direction of the wind driven generator and greatly improving the wind energy utilization rate.

Description

Wind vane alignment device and alignment method for wind driven generator

Technical Field

The invention belongs to the field of wind energy utilization, and particularly relates to a wind vane alignment device and method for a wind driven generator.

Background

An important measurement and control element in the wind driven generator is a wind vane which plays a role in monitoring the wind direction and enabling the unit to face the wind in the positive direction during the work of the wind driven generator. In the conventional wind driven generator installation, due to the error of the installation direction of the wind vane, the unit is often deviated from the wind direction in the operation, so that the reduction of the generating efficiency can reach more than twenty percent. The wind vane is arranged above the cabin cover, and the wind vane is difficult to be consistent with the front and back directions of the cabin cover by taking the cabin cover as a reference during installation, and on the other hand, the cabin cover has directional deviation relative to a main shaft, namely the front and back directions of the wind driven generator, so that the zero position of the wind vane is more difficult to be consistent with the front and back directions of the wind driven generator set.

Patent No. CN108303005.A discloses a wind vane installation zero position error detection and calibration device for a wind driven generator, which is installed on a wind vane and directly lines on a cabin cover to position and correct an installation angle.

Disclosure of Invention

The purpose of the invention is as follows: the invention provides a wind vane alignment device and method for a wind driven generator, and aims to solve the problem that large errors still exist between the zero position of a wind vane and the front and rear axial directions of the wind driven generator in the conventional alignment device and method.

The technical scheme is as follows:

a wind vane alignment device of a wind driven generator comprises a plumb staff gauge, an internal laser demarcation device, an external laser demarcation device and a cylindrical magnet block; the internal laser demarcation device is fixed at any point on the main shaft of the wind driven generator, the internal laser demarcation device simultaneously projects two laser lines which are perpendicular to each other, one laser line emitted by the internal laser demarcation device and the axis of the main shaft of the wind driven generator are in the same vertical plane, a plurality of vertical scales are arranged on the main shaft of the wind driven generator, and the vertical scales are arranged in the vertical plane; a plurality of cylindrical magnet blocks are arranged in the vertical plane, and are fixed inside and outside the cabin cover and arranged correspondingly to each other; a laser demarcation device outside the engine room is arranged on a straight line marked by a plurality of cylindrical magnet blocks outside the engine room cover;

or a plurality of cylindrical magnet blocks are arranged in two vertical planes where two laser lines emitted by the internal laser line projector are located, and the cylindrical magnet blocks are fixed inside and outside the cabin cover and are arranged correspondingly to each other; and a laser demarcation device outside the cabin is arranged on a straight line intersection point which is marked by a plurality of cylindrical magnet blocks and is vertical to each other.

A magnet is arranged below a base of the vertical scale and adsorbed on a main shaft of the wind driven generator, the support is inverted L-shaped, one end of the support is fixed on the base, the other end of the support is hinged with the scale, and the scale is located in a vertical plane where the axis of the main shaft of the wind driven generator is located.

The laser demarcation device is characterized in that a laser demarcation device sliding seat is arranged below the laser demarcation device and comprises a flat plate and adjustable supporting legs, the adjustable supporting legs are arranged below the flat plate, the flat plate is a long flat plate, three slide ways are arranged on the flat plate and are connected with the three supporting legs of the laser demarcation device outside the cover in a clamping mode, a level meter is further arranged on the flat plate, and the adjustable supporting legs are fixed outside the cabin cover.

The plurality of vertical scales are at least two vertical scales.

An alignment method of a wind vane alignment device of a wind driven generator comprises the following steps:

1) setting a plurality of reference points according to a vertical plane where the axis of the main shaft of the wind driven generator is located; placing an internal laser demarcation device and a plumb scale according to the datum point, and leveling the internal laser demarcation device;

2) determining the calibration position of a cylindrical magnet block inside the cabin cover according to two laser lines emitted by the internal laser line projector, and determining two calibration straight lines outside the cabin cover through the cylindrical magnet blocks inside and outside the cabin cover;

3) calibrating two calibration straight lines outside the cabin cover according to the cylindrical magnet block, and placing a laser demarcation device outside the cabin cover;

4) after the laser line projector outside the cover is leveled, the laser line of the laser line projector outside the cover is projected to the center line of the wind vane, and finally the wind vane is adjusted to point to the front side parallel to the main axis of the wind driven generator main shaft.

In step 4), the laser line projector outside the cover is placed on a calibration straight line corresponding to the main axis of the wind driven generator main shaft, the laser line projector outside the cover is leveled, the laser line projector outside the cover is rotated to project a laser line to the center line of the wind vane, the wind vane is rotated to project a zero-degree line of the wind vane by the laser line, an angle alpha rotated by the laser line projector outside the cover is recorded, then the wind vane is rotated reversely to rotate the zero-degree line of the wind vane by the same angle alpha, and at the moment, the wind vane points to the right front parallel to the main axis of the wind driven generator main shaft.

And 4) arranging a laser demarcation device sliding seat on the laser demarcation device outside the cover, placing the laser demarcation device sliding seat on a calibration straight line corresponding to the main axis of the main shaft of the wind driven generator when using the laser demarcation device sliding seat, arranging the laser demarcation device outside the cover on the cross point of the two calibration straight lines, opening the laser demarcation device outside the cover to project two laser lines, adjusting the angle of the laser demarcation device outside the cover to enable the two laser lines to be superposed with the two calibration straight lines, translating the laser demarcation device outside the cover along the laser demarcation device sliding seat to enable one laser line of the laser demarcation device outside the cover to project to the rotation center line of the wind vane, rotating the wind vane to enable a zero-degree line to be on the path through which the laser line passes, and enabling the wind vane to point to be right ahead parallel to the main axis of the main shaft of the wind driven generator at the moment.

The advantages and effects are as follows:

according to the invention, two points are found in the axis direction of the main shaft as a direction reference, the accuracy of the vertical plane of the axis of the main shaft is improved by adopting two vertical scales, two reference lines which are vertical to each other in the front-back direction and the left-right direction are projected above the inner part of the cabin cover by utilizing the laser line projector, and the two corresponding reference lines are found outside the cabin cover. By utilizing the device and the alignment method, the zero position of the mounted wind vane can be more accurately opposite to the front of the wind driven generator, so that the wind direction of the wind driven generator is accurately controlled, and the wind energy utilization rate is improved greatly.

Drawings

FIG. 1 is a schematic view of a datum point of a main shaft of a wind turbine;

FIG. 2 is a schematic view of the structure and operation of an internal laser line projector and an external laser line projector;

FIG. 3 is a schematic diagram of taking points of reference points in the nacelle cover;

FIG. 4 is a schematic diagram of the attraction of the inner and outer cylindrical magnet blocks of the nacelle cover;

FIG. 5 is a schematic view of the exterior of the nacelle cover without the laser line projector slide;

FIG. 6 is a schematic view of the outer structure of the nacelle cover when the laser line projector slide carriage is in use;

FIG. 7 is a schematic view of a vertical scale;

FIG. 8 is a schematic structural view of a slide carriage of the level gauge;

reference numbers in the figures: 1. the vertical scale comprises a vertical scale 101, a support 102, a pin shaft 103, a scale 104, a base 105, a magnet 106, a screw 2, a cabin cover 3, a cylindrical magnet block 4, a lining projector slide seat 401, a flat plate 402, a slide way 403, an adjustable support leg 404, a level meter 5, a wind vane 6, a main shaft 7, a main shaft front flange 8, a main shaft bearing 9, a gear box 10, an internal laser lining projector 11, an outer cover laser lining projector 111, laser lines I and 112 and a laser line II.

Detailed Description

The invention is described in more detail below with reference to the accompanying drawings.

As shown in fig. 1, 3, 5 and 6, the wind vane alignment device for the wind driven generator comprises a vertical scale 1, an internal laser demarcation device 10, an external laser demarcation device 11 and a cylindrical magnet block 3; the vertical scale 1 and the internal laser demarcation device 10 are arranged on a main shaft 6 of the wind driven generator, the cylindrical magnet block 3 is arranged inside and outside the cabin cover 2, and the cover external laser demarcation device 11 is arranged outside the cabin cover 2. Specifically, an internal laser demarcation device 10 is fixedly arranged at any point on a main shaft 6 of a wind driven generator, the internal laser demarcation device 10 simultaneously projects two laser lines which are perpendicular to each other, one laser line emitted by the internal laser demarcation device 10 and the axis of the main shaft 6 of the wind driven generator are in the same vertical plane, the vertical plane is the vertical plane of the axis of the main shaft 6 of the wind driven generator, a plurality of vertical scales 1 are arranged on the main shaft 6 of the wind driven generator, and the vertical scales 1 are arranged in the vertical plane; a plurality of cylindrical magnet blocks 3 are arranged in the vertical plane, the cylindrical magnet blocks 3 are fixed inside and outside the cabin cover 2, and the cylindrical magnet blocks 3 inside and outside the cabin cover 2 are arranged in a mutually attracting and corresponding manner; a laser demarcation device 11 outside the cabin cover 2 is arranged on a straight line marked by a plurality of cylindrical magnet blocks 3;

or, a plurality of cylindrical magnet blocks 3 are arranged in two vertical planes where two laser lines emitted by the internal laser line projector 10 are located, and the plurality of cylindrical magnet blocks 3 are fixed inside and outside the cabin cover 2 and are arranged correspondingly to each other; and an outer cover laser demarcation device 11 is arranged outside the cabin cover 2 and at the intersection point of mutually perpendicular straight lines marked by the plurality of cylindrical magnet blocks 3.

As shown in figure 2, the internal laser demarcation device 10 and the external laser demarcation device 11 have the same structure, the existing standard product is selected, the existing standard product is provided with a level gauge, the placement levelness of the standard product is corrected by adjusting three support legs, two laser lines, namely a laser line I and a laser line II, can be projected in two mutually perpendicular vertical planes, namely a front vertical plane, a rear vertical plane and a left vertical plane and a right vertical plane, the upper half part of the laser line I and the laser line II can rotate relative to a base, and angle scales are arranged on the base and used for marking the rotating angle. The internal laser line projector 10 and the cover external laser line projector 11 in the invention can also be the same laser line projector, i.e. after the internal laser line projector 10 is used for calibration in the cabin cover 2, the internal laser line projector 10 can be taken out for calibration of the position outside the cabin cover 2.

As shown in fig. 4, the cylindrical magnet block 3 is a coin of one-coin size and is slightly thick, and in the present embodiment, eight magnets are used in total, four magnets are used inside the nacelle cover, and four magnets are used outside the nacelle cover. The opposite cylindrical magnet blocks 3 inside and outside the nacelle cover 2 attract each other.

As shown in fig. 7, the vertical scale 1 includes a base 104, a support 101 and a scale 103, a magnet 105 is disposed below the base 104 of the vertical scale 1, the magnet 105 is attached to the main shaft 6 of the wind driven generator, the vertical scale 1 can be fixed at any point of the equipment through the magnet 105, the support 101 is in an inverted "L" shape, one end of the support 101 is fixed to the base 104 through a bolt 106, the support 101 can be fixed at any angle around the bolt 106, the other end of the support 101 is hinged to the scale 103 through a pin 102, and the scale 103 is located in a vertical plane where the axis of the main shaft 6 of the wind driven generator is located. The staff gauge 103 can freely swing around the pin shaft 102, and the two staff gauges 103 of the vertical staff gauge 1 arranged in front of and behind the wind driven generator main shaft 6 are vertically downward and parallel under the influence of gravity to form a vertical plane passing through the axis of the wind driven generator main shaft 6.

The alignment device further comprises a laser demarcation device sliding seat 4, as shown in fig. 8, the laser demarcation device sliding seat 4 comprises a flat plate 401 and an adjustable supporting leg 403, the adjustable supporting leg 403 is arranged below the flat plate 401, the flat plate 401 is a long flat plate, three sliding ways 402 are arranged on the flat plate 401, and the three sliding ways 402 are clamped with the three supporting legs of the laser demarcation device 11 outside the cover, namely the three supporting legs of the laser demarcation device 11 outside the cover can be placed in the three sliding ways 402 and slide along the three sliding ways for adjusting the position of the laser demarcation device 11 outside the cover, and a level meter 404 is further arranged on the flat plate 401 for adjusting the levelness of the flat plate 401; the adjustable legs 403 are fixed outside the nacelle cover 2. The adjustable legs 403 are the existing legs capable of adjusting the length of the legs, for example, each leg is an expansion leg capable of being connected by clamping or a screwing leg connected by threads.

The plurality of vertical scales 1 are at least two vertical scales 1 because two vertical scales 1 can determine one plane.

The alignment method of the wind vane alignment device of the wind driven generator comprises the following steps:

1) a reference point in the engine room cover 2 is set on a main axis of the wind driven generator main shaft 6; placing an internal laser demarcation device 10 and a plumb scale 1 according to an internal reference point of the cabin cover 2, and leveling the internal laser demarcation device 10;

in this embodiment, as shown in fig. 1, first, three reference points a, b, and c are found on the wind turbine main shaft 6 in a vertical plane passing through the axis of the wind turbine main shaft 6, where the three reference points a, b, and c do not overlap with each other, for example, a point a is on the main shaft bearing 8, a point b is on the gear box 9, and a point c is on the main shaft front flange 7, the internal laser line projector 10 is placed at a point c, and the levelness is adjusted.

One vertical scale 1 is adsorbed on a point a of a main shaft bearing 8 through a magnet 105 of a base 104, the other vertical scale 1 is adsorbed on a point b of a gear box 9 through a magnet 105 of the base 104, the adsorption points of the bases 104 of the two vertical scales 1 are adjusted, the angle of a support 101 is adjusted by loosening bolts 106, the tips of the two freely-drooping scales 103 point to the point a and the point b respectively, and then the center point of the internal laser demarcation device 10 and the two vertical scales 103 are located on the vertical symmetrical plane where the axis of the main shaft 6 of the wind driven generator is located.

2) According to two laser lines emitted by the internal laser demarcation device 10, the calibration position of the cylindrical magnet block 3 inside the cabin cover 2 is determined, and according to the principle that the cylindrical magnet blocks 3 attract each other, two calibration straight lines outside the cabin cover 2 are determined through the cylindrical magnet blocks 3 outside the cabin cover 2;

as shown in fig. 3, the internal laser line projector 10 is turned on, two laser lines I and II are projected in a vertical plane passing through the axis of the main shaft 6 of the wind turbine generator and in a plane perpendicular to the axis of the main shaft, the laser lines are projected on an object encountered in front, a broken line or a curve in the same plane is formed, the internal laser line projector 10 is adjusted, one of the laser lines (laser line II) is projected on two plumb scales 103 at the same time, the formed broken line is located in the plane passing through the axis of the main shaft 6, and the laser line II is also projected on the top of the cabin cover at the same time, namely, a line m; the other laser line (laser line I) is in a plane vertical to the axis of the main shaft 6, a broken line is formed when meeting the object, and the laser line I is simultaneously projected on the inner top of the cabin cover, namely a line n.

Two points are taken on the line m, and two cylindrical magnet blocks 3 are fixedly placed at the point p and the point q respectively; two points are taken on the line n, and two cylindrical magnet blocks 3 are fixedly placed at the point x and the point y respectively. In order to avoid the influence of the movement of the position of the cylindrical magnet block 3 inside the nacelle cover 2 when the cylindrical magnet block 3 is placed outside the nacelle cover 2, the cylindrical magnet block 3 inside the nacelle cover 2 may be fixed by means of an adhesive tape or the like.

3) Calibrating two calibration straight lines outside the cabin cover 2 according to the cylindrical magnet block 3, and placing a laser demarcation device 11 outside the cabin cover;

as shown in fig. 4, according to the principle of magnetic field force attraction, two cylindrical magnet blocks 3 at the same point attract each other to be centered. Another four cylindrical magnet blocks 3 are taken to be detected outside the nacelle cover 2, and the four cylindrical magnet blocks 3 are respectively attracted and aligned by the four cylindrical magnet blocks 3 inside the nacelle cover 2, so that the positions of the p point, the q point, the x point and the y point of the four cylindrical magnet blocks 3 inside the nacelle cover 2 are detected as reference points outside the nacelle and are respectively marked as a p 'point, a q' point, an x 'point and a y' point, the p 'point and the q' point form a calibration straight line p 'q', and the x 'point and the y' point form another calibration straight line x 'y', as shown in fig. 5.

4) After the laser projector 11 outside the cover is leveled, the laser line of the laser projector 11 outside the cover is projected to the central line of the wind vane 5, and finally the wind vane 5 is adjusted, so that the wind vane 5 points to the right front parallel to the main axis of the wind driven generator main shaft 6.

The wind vane alignment in the step 4) has two modes:

firstly, in step 4), the laser line projector 11 outside the cover is placed on a calibration straight line corresponding to the main axis of the wind driven generator main shaft 6, the laser line projector 11 outside the cover is leveled, the laser line projector 11 outside the cover is rotated to project a laser line to the central line of the wind vane 5, the wind vane 5 is rotated to project a zero-degree line of the wind vane 5 by the laser line, an angle alpha of the rotation of the laser line projector 11 outside the cover is recorded, then the wind vane 5 is rotated reversely to rotate the zero-degree line of the wind vane 5 reversely by the same angle alpha, and at the moment, the wind vane 5 points to the right front parallel to the main axis of the wind driven generator main shaft 6.

Specifically, as shown in fig. 5, a point O is taken outside the nacelle cover, the point O is aligned with a calibration straight line p 'q', the laser line projector 11 outside the nacelle cover is placed at the point O outside the nacelle cover and leveled, the laser line projector 11 outside the nacelle cover is rotated to project a laser line onto the center line of the wind vane 5, the wind vane 5 is rotated to project a zero-degree line of the wind vane onto the laser line, an angle α that the laser line projector 11 outside the nacelle cover rotates is recorded, and then the wind vane 5 is rotated in the reverse direction to rotate the zero-degree line of the wind vane 5 in the reverse direction by the same angle α even if the wind vane 5 points to the front side parallel to the axis of the main shaft.

Secondly, in the step 4), a laser demarcation device sliding seat 4 is arranged on the laser demarcation device 11 outside the cover, when the laser demarcation device sliding seat 4 is used, placing a laser projector sliding seat 4 on a calibration straight line corresponding to the main axis of a non-wind driven generator main shaft 6, arranging an outer cover laser projector 11 on the laser projector sliding seat 4 on the intersection point of the two calibration straight lines, starting the outer cover laser projector 11 to project two laser lines, adjusting the angle of the outer cover laser projector 11 to enable the two laser lines to coincide with the two calibration straight lines, translating the outer cover laser projector 11 along the laser projector sliding seat 4 to enable one laser line of the outer cover laser projector 11 to be projected to the rotation center line of a wind vane 5, rotating the wind vane 5 to enable a zero-degree line to be on the path through which the laser line passes, and enabling the wind vane 5 to point to the right front parallel to the main axis of the wind driven generator main shaft 6 at the moment.

Specifically, as shown in fig. 5, a point O is taken outside the nacelle cover, so that the point O is on the same straight line as the calibration straight line p 'q', the point O is also on the same straight line as the calibration straight line x 'y', and Op 'q'. su.ox 'y', the lining projector slide 4 is placed at the point O outside the nacelle cover, and the support legs 403 are adjusted by the level 404, so that the lining projector slide 4 is placed horizontally.

The laser line projector 11 outside the cover is placed on the line projector sliding seat 4, the position above the point O is formed, the three supporting legs are placed in the transverse groove of the sliding seat 4 and leveled, the laser line projector 11 outside the cover is opened to project two laser lines, the angle of the laser line projector 11 outside the cover is adjusted, one laser line passes through a calibration straight line p 'q', the laser line is in a vertical plane passing through the axis of the spindle, and the other laser line passes through a calibration straight line x 'y'.

The laser line projector 11 outside the housing is then translated along the grooves on the line projector slide 4 so that the laser line passing O p 'q' is projected onto the centre line of rotation of the wind vane 5, rotating the wind vane so that the zero line is also in the path of the laser line passing, thereby also directing the wind vane 5 directly in front of and parallel to the axis of the main shaft.

By implementing the invention, the zero position of the wind vane of the installed wind driven generator can accurately face to the right front of the wind driven generator, the wind vane direction accuracy is improved, and the power generation efficiency of the wind driven generator is increased.

Claims

1. The utility model provides a aerogenerator wind vane aligning device which characterized in that: the device comprises a plumb staff gauge (1), an internal laser demarcation device (10), an external laser demarcation device (11) and a cylindrical magnet block (3); the internal laser demarcation device (10) is fixed at any point on the main shaft (6) of the wind driven generator, the internal laser demarcation device (10) simultaneously projects two laser lines which are vertical to each other, one laser line emitted by the internal laser demarcation device (10) and the axis of the main shaft (6) of the wind driven generator are in the same vertical plane, a plurality of vertical scales (1) are arranged on the main shaft (6) of the wind driven generator, and the vertical scales (1) are arranged in the vertical plane; a plurality of cylindrical magnet blocks (3) are arranged in the vertical plane, and the cylindrical magnet blocks (3) are fixed inside and outside the cabin cover (2) and are arranged correspondingly to each other; a laser demarcation device (11) outside the cabin cover (2) is arranged on a straight line marked by a plurality of cylindrical magnet blocks (3);

or a plurality of cylindrical magnet blocks (3) are arranged in two vertical planes where two laser lines emitted by the internal laser line projector (10) are located, and the cylindrical magnet blocks (3) are fixed inside and outside the cabin cover (2) and are arranged correspondingly to each other; and a laser demarcation device (11) outside the cabin cover (2) is arranged on the intersection point of the straight lines which are marked by the plurality of cylindrical magnet blocks (3) and are vertical to each other.

2. Wind turbine vane alignment device according to claim 1, characterized in that: a magnet (105) is arranged below a base (104) of the vertical scale (1), the magnet (105) is adsorbed on a main shaft (6) of the wind driven generator, a support (101) is inverted L-shaped, one end of the support (101) is fixed on the base (104), the other end of the support (101) is hinged with a scale (103), and the scale (103) is located in a vertical plane where the axis of the main shaft (6) of the wind driven generator is located.

3. Wind turbine vane alignment device according to claim 1, characterized in that: laser demarcation appearance slide (4) are equipped with under cover outer laser demarcation appearance (11), laser demarcation appearance slide (4) are including dull and stereotyped (401) and adjustable landing leg (403), dull and stereotyped (401) below sets up adjustable landing leg (403), dull and stereotyped (401) are a rectangular flat board, be provided with three slides (402) on dull and stereotyped (401), three slides (402) and cover outer laser demarcation appearance (11) three landing legs joint, still be provided with spirit level (404) on dull and stereotyped (401), adjustable landing leg (403) are fixed in outside cabin cover (2).

4. Wind turbine vane alignment device according to claim 1, characterized in that: the plurality of vertical scales (1) are at least two vertical scales (1).

5.A method for aligning a wind vane alignment device of a wind turbine as claimed in claim 1, wherein: the method comprises the following steps:

1) setting a plurality of reference points in a vertical plane where the axis of the main shaft (6) of the wind driven generator is located; placing an internal laser demarcation device (10) and a plumb scale (1) according to the datum point, and leveling the internal laser demarcation device (10);

2) according to two laser lines emitted by the internal laser line projector (10), determining the calibration position of the cylindrical magnet block (3) inside the cabin cover (2), and determining two calibration straight lines outside the cabin cover (2) through the cylindrical magnet blocks (3) inside and outside the cabin cover (2);

3) calibrating two calibration straight lines outside the cabin cover (2) according to the cylindrical magnet block (3), and placing a laser demarcation device (11) outside the cabin cover;

4) after the laser line projector (11) outside the cover is leveled, the laser line of the laser line projector (11) outside the cover is projected to the central line of the wind vane (5), and finally the wind vane (5) is adjusted to enable the wind vane (5) to point to the right front parallel to the main axis of the wind driven generator main shaft (6).

6. The alignment method of the wind vane alignment device of the wind driven generator according to claim 5, wherein: in the step 4), the laser line projector (11) outside the cover is placed on a calibration straight line corresponding to the main axis of the wind driven generator main shaft (6), the laser line projector (11) outside the cover is leveled, the laser line projector (11) outside the cover is rotated to project laser lines to the central line of the wind vane (5), the wind vane (5) is rotated to project zero-degree lines of the wind vane (5) by the laser lines, the rotating angle alpha of the laser line projector (11) outside the cover is recorded, then the wind vane (5) is rotated reversely to rotate the zero-degree lines of the wind vane (5) reversely by the same angle alpha, and at the moment, the wind vane (5) points to the front side parallel to the main axis of the wind driven generator main shaft (6).

7. The alignment method of the wind vane alignment device of the wind driven generator according to claim 5, wherein: in the step 4), a laser demarcation device sliding seat (4) is arranged on the laser demarcation device (11) outside the cover, when the laser demarcation device sliding seat (4) is used, the method comprises the steps of placing a laser demarcation device sliding seat (4) on a calibration straight line corresponding to the main axis of a non-wind driven generator main shaft (6), arranging an outer cover laser demarcation device (11) on the laser demarcation device sliding seat (4) on the intersection point of two calibration straight lines, starting the outer cover laser demarcation device (11) to project two laser lines, adjusting the angle of the outer cover laser demarcation device (11) to enable the two laser lines to coincide with the two calibration straight lines, translating the outer cover laser demarcation device (11) along the laser demarcation device sliding seat (4), enabling one laser line of the outer cover laser demarcation device (11) to project to the rotation center line of a wind vane (5), rotating the wind vane (5) to enable a zero-degree line to be on the path through which the laser line passes, and enabling the wind vane (5) to point to the direct ahead of the main axis of the wind driven generator main shaft (6).