Method for assembling reaction type fork-shaped alternate pre-twisted blades

Abstract

The invention relates to a reaction type fork-shaped alternate pre-twisted blade assembling method. The method comprises the steps that S1, a blade fastening ring is installed on a hub; s2, first pre-twisted blades and arc-shaped measuring plates are alternately distributed in the circumferential direction of the hub, the first pre-twisted blades and the arc-shaped measuring plates are located between the blade fastening ring and the hub, the arc-shaped measuring plates are adjusted so that the relative positions of the first pre-twisted blades on the hub can be consistent, and the first pre-twisted blades are fixed; s3, the arc-shaped measuring plate in the step S2 is taken out, then a plurality of pre-twisted blades are installed at the original position where the arc-shaped measuring plate is installed, and the plurality of pre-twisted blades are alternately arranged in the mode of second pre-twisted blades, first pre-twisted blades and second pre-twisted blades, so that the first pre-twisted blades and the second pre-twisted blades are alternately arranged and are arranged in a row in the circumferential direction of the hub, and the first pre-twisted blades and the second pre-twisted blades are arranged in a row in the circumferential direction of the hub. And all the pre-twisted blades are fixed. The tool has the advantages of being easy to operate, accurate in positioning, high in assembling efficiency, capable of meeting product process and technical requirements, capable of being repeatedly used, wide in use and suitable for popularization.

Description

Technical Field

[0001] The invention relates to the technical field of power generation equipment, in particular to a reactionary fork-type alternate pre-twisted blade assembly method. Background Art

[0002] In recent years, steam turbine technology has been continuously developing. In order to further improve the flow efficiency of steam turbines, steam turbine manufacturers have begun to develop reaction pre-twisted blades. Due to different design concepts, the number of reaction pre-twisted blades is far more than that of impulse blades. The pre-twisted design of the blades can effectively form a full circle connection, which can greatly improve the vibration characteristics of the blades and increase the safety factor of the blades.

[0003] Among them, the reaction blades are generally short straight T-type pre-twisted blades, and fork-type alternating pre-twisted blades rarely appear. When the blades are assembled on the hub, the interference forces the shrouds of the alternating blades to twist in opposite directions. Make sure that the shroud contact surface reaches sufficient pre-torque. The shroud of the fork-type alternating pre-twisted blade is W-shaped. The shrouds and blade roots of adjacent blades each have 5 fitting surfaces and different clearance requirements. There are also clear requirements for the difference in the amount of misalignment between the roots and shrouds of adjacent blades. The blade shroud has a large torsion angle, and the pre-torque of the entire stage of pre-twisted blades must be uniform to avoid excessive pre-torque of some moving blades that causes the blades to be unable to be installed in the rotor, or damage the blades and wheel grooves. Summary of the invention

[0004] The present invention aims at the technical problems existing in the prior art and provides a reactionary fork-type alternating pre-twisted blade assembly method.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: A reactionary fork-type alternating pre-twisted blade assembly method comprises the following steps:

[0006] S1. Install the blade fastening ring on the hub;

[0007] S2, alternately arrange the first pre-twisted blades and the arc-shaped measuring plates along the circumferential direction of the hub, and make the first pre-twisted blades and the arc-shaped measuring plates located between the blade fastening ring and the hub, adjust the arc-shaped amount so that the relative position of each first pre-twisted blade on the hub is consistent, and fix the first pre-twisted blades;

[0008] S3, take out the arc measuring plate in step S2, and then install a plurality of pre-twisted blades at the original installation position of the arc measuring plate, and the plurality of pre-twisted blades are arranged alternately in the form of second pre-twisted blades, first pre-twisted blades, and second pre-twisted blades, so that the first pre-twisted blades and the second pre-twisted blades are arranged alternately and arranged in a row along the circumferential direction of the hub, and all the pre-twisted blades are fixed.

[0009] As a further technical solution, in step S1, the blade fastening ring is divided into two semicircular rings, an upper semicircular ring and a lower semicircular ring. A lifting ring is first installed on the upper semicircular ring, and then the upper semicircular ring is installed on the upper part of the hub using the lifting ring. Finally, the lower semicircular ring is installed, so that the upper semicircular ring and the lower semicircular ring form a ring-shaped blade fastening ring.

[0010] As a further technical solution, a plurality of threaded holes are arranged at equal intervals on the radial circumference of the blade fastening ring.

[0011] As a further technical solution, step S2 includes the following steps:

[0012] S21, first inserting a first pre-twisted blade into the gap between the blade fastening ring and the hub, and passing a screw through a corresponding threaded hole on the blade fastening ring to fix the first pre-twisted blade;

[0013] S22, then install the arc measuring plate and use screws to pass through the corresponding threaded holes on the blade fastening ring to fix the arc measuring plate; S23, repeat steps S21-S22, so that the circumferential direction of the hub is alternately covered with the first pre-twisted blades and the arc measuring plate, and remove the lifting ring;

[0014] S24, adjusting the arc-shaped measuring plate to make the relative position of each first pre-twisted blade on the hub consistent, and the first pre-twisted blades along the circumferential direction of the hub are arranged at equal intervals;

[0015] S25, drilling and ream the wheel hub together with the first pre-twisted blade, and installing pins to fix the first pre-twisted blade.

[0016] As a further technical solution, in step S3, the thickness of the arc measuring plate is equal to the sum of the total thicknesses of the pre-twisted blades that are alternately installed after the arc measuring plate is removed.

[0017] As a further technical solution, in step S24, the thickness of the arc measuring plate is adjustable, and the thickness of the arc measuring plate is changed by adjusting the thickness of the arc measuring plate and the gasket on the wheel hub.

[0018] As a further technical solution, it also includes S26, drilling a pin hole at the blade root of the first pre-twisted blade, and then assembling a pin and riveting it to fix the first pre-twisted blade on the outer circle of the hub.

[0019] Step S3 includes the following steps:

[0020] S31, taking out the arc measuring plate;

[0021] S32, install a plurality of pre-twisted blades at the original installation position of the arc-shaped measuring plate, and the plurality of pre-twisted blades are arranged alternately in the form of a second pre-twisted blade, a first pre-twisted blade, and a second pre-twisted blade, and each pre-twisted blade is placed and the radial line of each blade is checked with a radial line template, and then the pre-twisted blades are fixed by screws passing through the corresponding threaded holes on the blade fastening ring, so that the first pre-twisted blades and the second pre-twisted blades are arranged alternately and arranged in a row along the circumferential direction of the hub;

[0022] S33. Adjust the gap between the pre-twisted blade and the outer circle of the hub at the originally installed arc-shaped measuring plate so that the pre-twisted blade fits the outer circle of the hub, then drill pin holes at the blade roots of the pre-twisted blades, assemble pins and rivet them.

[0023] As a further technical solution, in step S32, after tightening the corresponding screw on a pre-twisted blade, the corresponding screw on another pre-twisted blade on the hub that is symmetrical to the pre-twisted blade must be tightened, so that all pre-twisted blades installed on the hub are evenly located in the gap between the hub and the blade fastening ring.

[0024] As a further technical solution, step S33 includes the following steps:

[0025] S331, tighten the screw on a pre-twisted blade, and at the same time push the pre-twisted blade toward the outer circle of the hub to reduce the gap between the root of the blade and the outer circle of the hub, and then tighten the pre-twisted blade symmetrical to the pre-twisted blade on the hub in the same way to reduce the gap between the root and the outer circle of the hub;

[0026] S332, repeating step S331 to ensure that all pre-twisted blades can symmetrically and evenly reduce the clearance with the outer circle of the hub, and that the shrouds of adjacent pre-twisted blades are connected;

[0027] S333, repeating steps S331-S332 until, except for the first second pre-twisted blade at the replacement arc-shaped measuring plate, the other pre-twisted blades are in contact with the outer circle of the hub;

[0028] S334, circumferentially and symmetrically tapping the middle shrouds of all the first second pre-twisted blades in step S333 to make them fit with the outer circumference of the hub;

[0029] S335. Drill pin holes at the blade roots of all pre-twisted blades, then assemble process pins and rivet them.

[0030] The beneficial effects of the present invention are:

[0031] 1. In this method, an arc-shaped measuring plate is used to space the first pre-twisted blades so that they are evenly distributed on the entire hub along the circumferential direction, thereby ensuring that the relative positions of adjacent first pre-twisted blades are consistent and that each pre-twisted blade installed in the subsequent process is twisted into place to meet the assembly requirements;

[0032] 2. This method uses simple auxiliary tools such as blade fastening rings, bolts, and lifting rings to fix the pre-twisted blades on the hub, and applies a certain pre-twisted force to twist the pre-twisted blades to simulate the final assembly state. This installation method can pre-check whether the assembly meets the requirements and provide direction for corresponding adjustment measures;

[0033] 3. The thickness of the arc-shaped measuring plate used in this method is adjustable. The thickness of the arc-shaped measuring plate and the gasket on the hub can be adjusted according to the actual assembly situation to change the thickness of the arc-shaped measuring plate, thereby adjusting the relative position of the first pre-twisted blades to ensure that the first pre-twisted blades are evenly distributed along the circumferential direction of the hub;

[0034] 4. This method is simple to operate, accurate in positioning, and has high assembly efficiency. It can meet product process and technical requirements and can be reused. It is suitable for fork-type alternating pre-twisted blades and blades with similar alternating pre-twisted structures. It is widely used and suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic flow chart of a reactionary fork-type alternating pre-twisted blade assembly method of the present invention;

[0036] Figure 2 It is a schematic diagram of pre-assembly of pre-twisted blades in a reactionary fork-type alternating pre-twisted blade assembly method of the present invention;

[0037] Figure 3 for Figure 2 The middle part of the structure is enlarged schematic diagram;

[0038] Figure 4 It is a partial structural schematic diagram of the final assembly of pre-twisted blades in a reactionary fork-type alternating pre-twisted blade assembly method of the present invention;

[0039] Figure 5 for Figure 4 The middle part of the structure is enlarged schematic diagram;

[0040] Figure 6 The diagram is a schematic diagram of the distribution of the pre-twisted blades on the hub when they are numbered, wherein the numbers on the diagram represent the pre-twisted blade numbers;

[0041] Figure 7 It is a schematic diagram of the shrouds of adjacent pre-twisted blades twisting in opposite directions, wherein the direction indicated by the arrow is the pre-twisted direction.

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] Blade fastening ring 1, threaded hole 11, hub 2, first pre-twisted blade 3, arc-shaped measuring plate 4, second pre-twisted blade 5, lifting ring 6, screw 7, nut 8, pin 9. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0045] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0046] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0047] This embodiment is to solve the difficulty in installing fork-type alternating pre-twisted blades in the prior art, and provides a reactionary fork-type alternating pre-twisted blade assembly method. Figure 1 , including the following steps:

[0048] S1, installing the blade fastening ring 1 on the hub 2;

[0049] S2, alternately arrange the first pre-twisted blades 3 and the arc-shaped measuring plates 4 along the circumferential direction of the hub 2, and make the first pre-twisted blades 3 and the arc-shaped measuring plates 4 located between the blade fastening ring 1 and the hub 2, adjust the arc-shaped measuring plates 4 to make the relative position of each first pre-twisted blade 3 on the hub 2 consistent, and fix the first pre-twisted blades by pins 9; (See Figure 2 )

[0050] S3, take out the arc measuring plate 4 in step S2, and then install a plurality of pre-twisted blades at the original installation position of the arc measuring plate 4, and the plurality of pre-twisted blades are alternately arranged in the form of second pre-twisted blades 5, first pre-twisted blades 3, and second pre-twisted blades 5, so that the first pre-twisted blades 3 and the second pre-twisted blades 5 are arranged in an alternating manner and arranged in a row along the circumferential direction of the hub 2, and all the pre-twisted blades are fixed by pins 9, thus completing the installation of the pre-twisted blades.

[0051] For example, the number of pre-twisted blades (second pre-twisted blade 5, first pre-twisted blade 3, second pre-twisted blade 5, etc.) alternately installed at the original installation arc-shaped measuring plate 4 is determined according to actual conditions, such as the hub size, the pre-twisted blade size, etc.;

[0052] In the embodiment of the present disclosure, in step S1, the blade fastening ring 1 is divided into two semicircular rings, an upper semicircular ring and a lower semicircular ring. The lifting ring 6 is first installed on the upper semicircular ring, and then the upper semicircular ring is installed on the upper part of the hub 2 by using the lifting ring 6. Finally, the lower semicircular ring is installed, so that the upper semicircular ring and the lower semicircular ring constitute a ring-shaped blade fastening ring 1.

[0053] In order to facilitate the subsequent installation of the pre-twisted blades, a plurality of threaded holes 11 are arranged at equal intervals on the radial circumference of the blade fastening ring 1, so that screws 7 can be inserted into the matching nuts 8 to fasten the installation of the pre-twisted blades, the arc-shaped measuring plate 4 and the hanging ring 6;

[0054] For example, see Figure 2 , Figure 3 The arc-shaped measuring plate 4 is fan-shaped, and in step S3, the thickness of the arc-shaped measuring plate 4 is equal to the total thickness of the pre-twisted blades installed alternately after the arc-shaped measuring plate 4 is removed, so that the pre-twisted blades replacing the arc-shaped measuring plate 4 can be twisted in the opposite direction by applying a pre-twisted force (see Figure 7 , where θ is the pre-twist angle).

[0055] In an embodiment of the present disclosure, step S2 includes the following steps:

[0056] S21, first install a first pre-twisted blade 3 into the gap between the blade fastening ring 1 and the hub 2, and use a screw 7 to pass through the corresponding threaded hole 11 on the blade fastening ring 1 to fix the first pre-twisted blade 3;

[0057] S22, install the arc measuring plate 4 again and use the screw 7 to pass through the threaded hole 11 at the corresponding position on the blade fastening ring 1 to fix the arc measuring plate 4; S23 repeat steps S21-S22, so that the circumferential direction of the hub 2 is alternately covered with the first pre-twisted blades 3 and the arc measuring plate 4, and remove the lifting ring 6; (see Figure 2 )

[0058] S24, adjusting the arc-shaped measuring plate 4 to make the relative position of each first pre-twisted blade 3 on the hub 2 consistent; the first pre-twisted blades 3 are arranged at equal intervals along the circumferential direction of the hub 2;

[0059] S25, drilling and reaming the hub 2 together with the first pre-twisted blade 3, and installing the pin 9 to fix the first pre-twisted blade 3;

[0060] For example, in steps S21-S22, after the first pre-twisted blade 3 is installed, its radial lines are checked with a radial line template to determine whether it is installed correctly. If it is not correct, it needs to be adjusted until it is correct, and then the screw 7 is inserted into the screw 7 hole on the blade fastening ring 1 corresponding to the first pre-twisted blade 3 to fix the first pre-twisted blade 3.

[0061] In an embodiment of the present disclosure, in step S24, the thickness of the arc measuring plate 4 is adjustable, and the thickness of the arc measuring plate 4 is changed by adjusting the gasket on the arc measuring plate 4 and the hub 2, so that the first pre-twisted blades 3 in the circumferential direction of the hub 2 are arranged at equal intervals.

[0062] In the embodiment of the present disclosure, in step S24, a pin hole is drilled at the blade root of the first pre-twisted blade 3, and then a pin 9 is installed and riveted to fix the first pre-twisted blade 3 on the outer circle of the hub 2. That is, a pin hole is drilled at the blade root of the first pre-twisted blade 3 on both sides of each arc-shaped measuring plate 4, and a pin 9 is installed and riveted to the hub 2 to fix the position of the first pre-twisted blade 3. (See Figure 2-Figure 3 )

[0063] In an embodiment of the present disclosure, step S3 includes the following steps:

[0064] S31, take out the arc measuring plate 4;

[0065] S32, install a plurality of pre-twisted blades at the original installation position of the arc-shaped measuring plate 4, and the plurality of pre-twisted blades are arranged alternately in the form of the second pre-twisted blade 5, the first pre-twisted blade 3, and the second pre-twisted blade 5, and each pre-twisted blade is placed and the radial line of each blade is checked with a radial line template, and then the screws 7 are passed through the corresponding threaded holes 11 on the blade fastening ring 1 to fix the pre-twisted blades, so that the first pre-twisted blades 3 and the second pre-twisted blades 5 are arranged alternately and arranged in a row along the circumferential direction of the hub 2;

[0066] S33, adjust the gap between the pre-twisted blade and the outer circle of the hub 2 at the original installation arc measuring plate 4, so that the pre-twisted blade fits the outer circle of the hub 2, and then drill a pin hole at the root of the pre-twisted blade, install the pin 9 and rivet it. (See Figure 4-Figure 5 )

[0067] For example, in step S32, the radial lines on all pre-twisted blades should be checked and qualified to avoid blade tilting; and when using screw 7 to pass through the screw 7 hole on the blade fastening ring 1 to fix the pre-twisted blade, it should be noted that the root of the pre-twisted blade should not be assembled to the bottom, that is, a gap should be reserved between the hub 2, but it is necessary to ensure that the pre-twisted blade does not fall off; finally, the screw 7 is fastened to the blade fastening ring 1 with a nut 8 to prevent the screw 7 from shaking.

[0068] In the embodiment of the present disclosure, in step S32, after tightening each screw 7 corresponding to a pre-twisted blade, the screw 7 corresponding to another pre-twisted blade symmetrical to the pre-twisted blade on the hub 2 (i.e., the pre-twisted blades in another group of pre-assembled components, the positions of the two symmetrical pre-twisted blades constitute 180°) needs to be tightened, so that all pre-twisted blades can evenly reduce the gap between the blade root and the outer circle of the hub 2, until the gap between the first pre-twisted blade 3, the second pre-twisted blade 5 and the outer circle of the hub 2 reaches the preset requirement;

[0069] For example, an adjacent first pre-twisted blade 3 and an arc-shaped measuring plate 4 in step S2 are taken as a group of pre-installed components, and each group of pre-installed components includes a first pre-twisted blade 3, a second pre-twisted blade 5, a first pre-twisted blade 3, a second pre-twisted blade 5, and a first pre-twisted blade 3 arranged in sequence, and the gap between the first and last two first pre-twisted blades 3 and the outer circle of the hub 2 is 0, but at this time, the second pre-twisted blade 5, the first pre-twisted blade 3, and the second pre-twisted blade 5 arranged in the middle have gaps H1, H2, and H3 (where the unit is mm) with the outer circle of the hub 2, respectively, and H1=H3﹤H2.

[0070] For example, all pre-twisted blades are fixed by a screw 7 passing through a threaded hole 11 on the blade fastening ring 1, that is, one pre-twisted blade corresponds to one screw 7, one threaded hole 11 and one nut 8, so that the corresponding pre-twisted blades, screws 7, threaded holes 11 and nuts 8 are located on the same straight line.

[0071] In an embodiment of the present disclosure, step S33 includes the following steps:

[0072] S331, tighten the screw 7 on a pre-twisted blade, and push the pre-twisted blade toward the outer circle of the hub 2 to reduce the gap between the blade root and the outer circle of the hub 2, and then tighten the screw 7 on the pre-twisted blade symmetrically 180° on the hub 2 in the same way to reduce the gap between the blade root and the outer circle of the hub 2;

[0073] S332, repeating step S331 to ensure that all pre-twisted blades can evenly reduce the gap with the outer circle of the hub 2, and the shrouds of adjacent pre-twisted blades are connected;

[0074] S333, repeating steps S331-S332 until, except for the first second pre-twisted blade 5 at the arc-shaped measuring plate 4, the other pre-twisted blades are in contact with the outer circle of the hub 2;

[0075] S334, circumferentially and symmetrically knock the shrouds of all the first second pre-twisted blades 5 in step S333, so that the roots of the blades fit the outer circle of the hub 2;

[0076] S335, drill pin holes at the blade roots of all pre-twisted blades, then assemble the pins 9 and rivet them. (See Figure 4-Figure 5 , is the picture after the pre-twisted blades are assembled)

[0077] For example, in step S331, the pre-assembled components installed on the wheel hub 2 are numbered, such as numbered from 1 to n (see Figure 6 , such as numbered 1-10), at this time, the pre-twisted blade in the pre-installed component numbered 1 can be selected, and the screw 7 set on it can be tightened, and then the pre-twisted blade can be pushed toward the outer circle direction of the hub 2 to reduce the gap between the root of the blade and the outer circle of the hub 2 by 1mm, and then the nut 8 can be tightened to fix the pre-twisted blade; the pre-twisted blade in the pre-installed component numbered 2 can be selected, and the screw 7 on it can be tightened, and then the above step S331 can be repeated; for the pre-twisted blades processed by step S333, H1=0m, H2≈2.5m, and H3=0m in each group of pre-installed components.

[0078] S336. Before drilling the pin holes, check the torsion angle of each pre-twisted blade and the gap between the shroud and the blade root to ensure that they meet the installation requirements before assembling the pins.

[0079] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0081] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A reactionary fork-type alternating pre-twisted blade assembly method, characterized in that: The steps include: S1. Install the blade fastening ring (1) on the hub (2); S2, alternately distributing the first pre-twisted blades (3) and the arc-shaped measuring plates (4) along the circumferential direction of the wheel hub (2), and making the first pre-twisted blades (3) and the arc-shaped measuring plates (4) located between the blade fastening ring (1) and the wheel hub (2), adjusting the arc-shaped measuring plates (4) so ​​that the relative positions of each first pre-twisted blade (3) on the wheel hub (2) are consistent, and fixing the first pre-twisted blades (3); S3, taking out the arc measuring plate (4) in step S2, and then installing a plurality of pre-twisted blades at the position where the arc measuring plate (4) was originally installed, and the plurality of pre-twisted blades are arranged alternately in the form of a second pre-twisted blade (5), a first pre-twisted blade (3), and a second pre-twisted blade (5), so that the first pre-twisted blade (3) and the second pre-twisted blade (5) are arranged in an alternating manner and arranged in a row along the circumferential direction of the hub (2), and all the pre-twisted blades are fixed.

2. The method according to claim 1, characterized in that In step S1, the blade fastening ring (1) is divided into two semicircular rings, an upper semicircular ring and a lower semicircular ring. The lifting ring (6) is first installed on the upper semicircular ring, and then the upper semicircular ring is installed on the upper part of the hub (2) by using the lifting ring (6). Finally, the lower semicircular ring is installed, so that the upper semicircular ring and the lower semicircular ring form a ring-shaped blade fastening ring (1).

3. The method according to claim 2, characterized in that A plurality of threaded holes (11) are arranged at equal intervals on the radial circumference of the blade fastening ring (1).

4. The method according to claim 3, characterized in that: Step S2 includes the following steps: S21, first inserting a first pre-twisted blade (3) into the gap between the blade fastening ring (1) and the hub (2), and using a screw (7) to pass through a corresponding threaded hole (11) on the blade fastening ring (1) to fix the first pre-twisted blade (3); S22, insert the arc-shaped measuring plate (4) and use screws (7) to pass through the corresponding threaded holes (11) on the blade fastening ring (1) to fix the arc-shaped measuring plate (4); S23, repeating steps S21-S22, so that the first pre-twisted blades (3) and the arc-shaped measuring plates (4) are alternately distributed in the circumferential direction of the hub (2), and the lifting ring (6) is removed; S24, adjusting the arc-shaped measuring plate (4) so ​​that the relative positions of each first pre-twisted blade (3) on the hub are consistent, and the first pre-twisted blades (3) are arranged at equal intervals along the circumferential direction of the hub (2); S25, drilling and reaming together with the first pre-twisted blade (3) on the hub (2), and installing a pin (9) to fix the first pre-twisted blade (3).

5. The method according to claim 1, characterized in that In step S3, the thickness of the arc measuring plate (4) is equal to the total thickness of the pre-twisted blades installed alternately after the arc measuring plate (4) is removed.

6. The method according to claim 4, characterized in that In step S24, the thickness of the arc-shaped measuring plate (4) is adjustable, and the thickness of the arc-shaped measuring plate (4) is changed by adjusting the thickness of the gasket on the arc-shaped measuring plate (4) and the wheel hub (2).

7. The method according to claim 4, characterized in that In step S24, a pin hole is drilled at the blade root of the first pre-twisted blade (3), and then a pin (9) is assembled and riveted, so that the first pre-twisted blade (3) is fixed on the outer circle of the hub (2).

8. The method according to claim 3, characterized in that Step S3 includes the following steps: S31, taking out the arc measuring plate (4); S32, installing a plurality of pre-twisted blades at the position where the arc-shaped measuring plate (4) was originally installed, and the plurality of pre-twisted blades are arranged alternately in the form of a second pre-twisted blade (5), a first pre-twisted blade (3), and a second pre-twisted blade (5), and each pre-twisted blade is placed and the radial line of each blade is checked with a radial line template, and then the pre-twisted blades are fixed by passing a screw (7) through the corresponding threaded hole (11) on the blade fastening ring (1), so that the first pre-twisted blade (3) and the second pre-twisted blade (5) are arranged alternately and arranged in a row along the circumferential direction of the hub (2); S33, adjusting the clearance between the pre-twisted blade and the outer circumference of the hub (2) at the originally installed arc-shaped measuring plate (4) so ​​that the pre-twisted blade fits the outer circumference of the hub (2), and then drilling a pin hole at the blade root of the pre-twisted blade, assembling a pin (9) and riveting it.

9. The method according to claim 8, characterized in that In step S32, after tightening each screw (7) corresponding to a pre-twisted blade, the screw (7) corresponding to another pre-twisted blade on the hub (2) that is symmetrical to the pre-twisted blade needs to be tightened, so that all pre-twisted blades installed on the hub (2) are evenly located in the gap between the hub (2) and the blade fastening ring (1).

10. The method according to claim 8, characterized in that Step S33 includes the following steps: S331, tighten the screw (7) on a pre-twisted blade, and at the same time push the pre-twisted blade toward the outer circle of the hub (2), so that the gap between the root of the blade and the outer circle of the hub (2) is reduced, and then tighten the pre-twisted blade on the hub (2) symmetrical to the pre-twisted blade in the same manner, so as to reduce the gap between the root of the blade and the outer circle of the hub (2); S332, repeating step S331 to ensure that all pre-twisted blades can symmetrically and evenly reduce the outer circle gap with the hub (2), and that the shrouds of adjacent pre-twisted blades are connected; S333, repeating steps S331-S332 until, except for the first second pre-twisted blade (5) at the arc-shaped measuring plate (4), the other pre-twisted blades are all in contact with the outer circle of the hub (2); S334, circumferentially and symmetrically knock the circumferences of all the first second pre-twisted blades (5) in step S333 to make them fit the outer circumference of the hub (2); S335, drill pin holes at the blade roots of all pre-twisted blades, then assemble pins (9) and rivet them.

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