CN220435209U

CN220435209U - Anti-fatigue stud for wind turbine generator blade connection

Info

Publication number: CN220435209U
Application number: CN202321017077.0U
Authority: CN
Inventors: 孙富; 谢桃红; 马斌龙; 刘春辉; 马文强
Original assignee: Dingxi Sharp High Strength Bolt Ltd
Current assignee: Dingxi Sharp High Strength Bolt Ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2024-02-02
Anticipated expiration: 2033-04-28

Abstract

The utility model discloses an anti-fatigue stud for wind turbine blade connection, which comprises a unthreaded polished rod; the two conical rods are respectively arranged at two ends of the unthreaded polished rod, and the small-diameter ends of the conical rods are in arc transition connection with the unthreaded polished rod through the first connection transition zone; the two studs are respectively and correspondingly arranged on the large-diameter ends of the two conical rods; the diameter of the unthreaded optical rod is smaller than the pitch diameter of the stud.

Description

Anti-fatigue stud for wind turbine generator blade connection

Technical Field

The utility model relates to the technical field of studs for wind turbine generator blade connection, in particular to an anti-fatigue stud for wind turbine generator blade connection.

Background

The stud bolt fracture event for wind generating set blade connection happens at the moment, and through comprehensive inspection, detection and failure analysis, the main reason for the occurrence of the event is considered to be that a plurality of stress concentration points exist in the stud bolt structural form, alternating stress is applied to the stud bolt in the service process, fatigue damage is generated at the stud bolt stress concentration points at first, fatigue cracks are formed, and brittle fatigue fracture of the stud bolt is finally caused at the stress concentration points. When the stud is broken by inspection, the broken part is generally found to be about 70% at the first buckling thread after the stud and the nut are screwed together; a small amount of breakage is about 30% at the transition of the thread and unthreaded polished rod. Accordingly, there is an urgent need for an anti-fatigue stud that can address the above-described problems.

Disclosure of Invention

Aiming at the technical problems, the utility model provides an anti-fatigue stud for wind turbine blade connection.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

anti-fatigue stud for wind turbine blade connection comprises:

a unthreaded polished rod;

the two conical rods are respectively arranged at two ends of the unthreaded polished rod, and the small-diameter ends of the conical rods are in arc transition connection with the unthreaded polished rod through the first connection transition zone;

the two studs are respectively and correspondingly arranged on the large-diameter ends of the two conical rods;

the diameter of the unthreaded optical rod is smaller than the pitch diameter of the stud.

And an inner hexagonal counter bore is formed in the end face of the stud.

And a first connection transition area of the conical rod and the unthreaded polished rod is provided with an arc transition with R values of R25-R100.

The root and the tip of the thread on the stud are both in R arc transition, and the R value is as follows: rmin=0.15p, rmax=0.18p, p being the pitch.

The taper of the tapered rod is 10 degrees.

And a second connection transition region of the stud and the conical rod is provided with an arc transition with R values of R25-R100.

The screw thread at the second connection transition area of the stud and the conical rod is communicated without ending.

The beneficial effects of the utility model are as follows:

1. the utility model processes the hexagon countersink at one end of the double-end stud, which is convenient for installation and wrenching;

2. the utility model is a waist-shaped rod double-end stud, which improves the flexibility of the stud, reduces the influence of bending moment on the stud, and further improves the fatigue resistance of the stud;

3. according to the utility model, the first connection transition region and the second connection transition region are both provided with the arc transition with R values of R25-R100, so that the stress concentration risk is eliminated;

4. the thread root and the thread tip of the thread are both of R arc transition tooth shapes, the designed R value is Rmin=0.15P, rmax=0.18P, and experiments prove that the thread can play a role in resisting fatigue and can completely eliminate stress concentration of the thread root;

5. the screw tail of the utility model is communicated without ending, and the stress concentration caused by ending of the screw thread is eliminated.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view of the structure of the root and tip of the present utility model.

Detailed Description

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Example 1

As shown in fig. 1, the anti-fatigue stud for wind turbine blade connection includes: a unthreaded polished rod 4; the two conical rods 3 are respectively arranged at two ends of the unthreaded polished rod 4, the small-diameter end of each conical rod 3 is in arc transition connection with the unthreaded polished rod 4 through a first connection transition zone 6, and the taper of each conical rod 3 is 10 degrees; the two studs 2 are respectively and correspondingly arranged on the large-diameter ends of the two conical rods 3, and threads at the second connection transition zone 5 of the stud 2 and the conical rod 3 are penetrated and not terminated; wherein the diameter of the unthreaded polished rod 4 is smaller than the pitch diameter of the stud 2.

As shown in fig. 1, an end face of a stud 2 is provided with a hexagon socket 1.

As shown in fig. 1, the first connection transition zone 6 of the conical rod 3 and the unthreaded polished rod 4 sets an arc transition with R value R25.

As shown in fig. 2, the root 7 and the tip 8 of the thread on the stud 2 are both in R arc transition, and the R value is: r=0.15p, p being the pitch.

As shown in fig. 1, the second connection transition zone 5 of the stud 2 and the conical rod 3 sets an arc transition with R value R25.

When the utility model is installed and used, the stud 2 passes through the flange hole, one end of the non-inner hexagonal counter bore 1 is screwed into the embedded screw sleeve in the base body, and one end of the inner hexagonal counter bore 1 is screwed with the nut and screwed up.

Example 2

As shown in fig. 1, the first connection transition zone 6 of the tapered rod 3 and the unthreaded polished rod 4 sets an arc transition with R value R100.

As shown in fig. 2, the root 7 and the tip 8 of the thread on the stud 2 are both in R arc transition, and the R value is: r=0.18p, p being the pitch.

As shown in fig. 1, the second connection transition zone 5 of the stud 2 and the tapered rod 3 sets a circular arc transition with R value R100.

Other structures and methods of use are consistent with example 1.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims

1. Anti-fatigue stud for wind turbine generator blade connection, which is characterized by comprising:

a unthreaded polished rod (4);

the two conical rods (3) are respectively arranged at two ends of the unthreaded polished rod (4), and the small-diameter ends of the conical rods (3) are in arc transition connection with the unthreaded polished rod (4) through a first connection transition zone (6);

the two studs (2) are respectively and correspondingly arranged on the large-diameter ends of the two conical rods (3);

the diameter of the unthreaded polished rod (4) is smaller than the pitch diameter of the stud (2).

2. The anti-fatigue stud for wind turbine blade connection of claim 1, wherein: an inner hexagonal counter bore (1) is formed in the end face of the stud (2).

3. The anti-fatigue stud for wind turbine blade connection of claim 1, wherein: the first connection transition area (6) of the conical rod (3) and the unthreaded polished rod (4) is provided with an arc transition with the R value of R25mm-R100 mm.

4. The anti-fatigue stud for wind turbine blade connection of claim 1, wherein: the thread root (7) and the thread tip (8) of the thread on the stud (2) are in R arc transition, and the R value is as follows: rmin=0.15p, rmax=0.18p, p being the pitch.

5. The anti-fatigue stud for wind turbine blade connection according to claim 1, the method is characterized in that: the taper of the conical rod (3) is 10 degrees.

6. The anti-fatigue stud for wind turbine blade connection according to claim 1 or 3, wherein: and a second connection transition area (5) of the stud (2) and the conical rod (3) is provided with an arc transition with the R value of R25mm-R100 mm.

7. The anti-fatigue stud for wind turbine blade connection of claim 6, wherein: the screw thread at the second connection transition area (5) of the stud (2) and the conical rod (3) is communicated without ending.