CN216131034U - Rotary self-locking type anti-fatigue wind power flange - Google Patents

Abstract

The utility model relates to the technical field of wind power tower cylinder connection, in particular to a rotary self-locking type anti-fatigue wind power flange. Comprises an upper flange plate and a lower flange plate; an annular vertical plate is arranged on the outer side of the upper flange plate and protrudes downwards; the inner wall of the protruding part is circumferentially provided with an inner locking block, and the outer side of the lower flange plate is provided with an outer locking block matched with the inner locking block; the inner locking blocks and the outer locking blocks are distributed in an staggered mode in the axial direction. The utility model can realize integral self-locking of the upper flange plate and the lower flange plate through the inner self-locking block and the outer self-locking block, ensure the tight connection of the upper flange plate and the lower flange plate, effectively prevent corrosive substances from entering the inside of the flange plates, and realize the symmetrical stress of the tower barrel flange under repeated load, thereby overcoming the lever amplification effect of the traditional wind power flange connection on the stress amplitude under the action of eccentric load, effectively improving the stress behavior of a fastener, and improving the fatigue resistance of the fastener from the action effect aspect.

Description

Rotary self-locking type anti-fatigue wind power flange

Technical Field

The utility model relates to the technical field of wind power tower cylinder connection, in particular to a rotary self-locking type anti-fatigue wind power flange.

Background

Nowadays, along with the rapid development of the science and technology level, wind turbine generator system gradually develops to maximization and ocean, in order to more efficient utilization wind energy resource, fan wheel diameter and tower section of thick bamboo height constantly increase, but correspondingly, the alternating load that the fan faced also further increases, and the flange joint position of tower section of thick bamboo appears the fatigue fracture inefficacy of flange joint department bolt and shakes to lead to the not hard up phenomenon under the effect of long-term alternating load easily to arouse a series of engineering accidents.

In the working process of the traditional wind power tower cylinder, the flange plate is in an eccentric tension state, after the outer edge of the flange plate is opened and moved, the stress of the bolt can be linearly increased along with the tension of the cylinder wall, and the stress amplitude can also be obviously increased, so that the traditional flange plate structure has certain defects, and the pure tension stress mode of the bolt cannot be ensured to a great extent. Meanwhile, in the marine environment, the wind turbine generator can also face the corrosion problem of a corrosion medium under the environment conditions of high salt spray and high humidity, and the opening of the flange can introduce the corrosion medium into the wind turbine generator to cause corrosion fatigue coupling damage of a connecting part.

In addition, in the existing high-strength bolt connection technology, the threads of the nut and the bolt only form local surface-to-surface contact at the thread side, and the contact area of the threads is usually less than 30% of the total area of the threads, so that the volume of a gap between the nut and the bolt is large. Therefore, when the tower cylinder flange is subjected to vibration and impact load, relative motion can occur between the two thread surfaces, so that the vibration resistance, the looseness prevention and the fatigue resistance of the tower cylinder flange connected by the high-strength bolts are poor.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, the utility model aims to provide a rotary self-locking type anti-fatigue wind power flange to overcome the defects that the flange is easy to open, corrosive media invade, and the flange is easy to vibrate to cause loosening and fatigue damage, and the connection stress mode is defective in the traditional wind power tower flange connection.

In order to achieve the purpose, the utility model adopts the technical scheme that: a rotary self-locking type anti-fatigue wind power flange comprises an upper flange plate and a lower flange plate; an annular vertical plate is arranged on the outer side of the upper flange plate and protrudes downwards; the inner wall of the protruding part is circumferentially provided with an inner locking block, and the outer side of the lower flange plate is provided with an outer locking block matched with the inner locking block; the inner locking blocks and the outer locking blocks are distributed in an staggered mode in the axial direction.

Furthermore, through holes are uniformly formed in the upper flange plate and the lower flange plate along the circumferential direction of the upper flange plate and the lower flange plate; and a rivet penetrates through the through hole to connect and fix the upper flange plate and the lower flange plate.

Further, the rivet be the annular rivet, divide into rivet head, polished rod section, annular groove section and tail tooth four bibliographic categories branch, the tail tooth section is equipped with the necking down cross-section.

Further, the ring groove rivet is assembled with the ring sleeve in a pulling rivet mode.

Compared with the prior art, the utility model has the following beneficial effects

1. The utility model can realize integral self-locking of the upper flange plate and the lower flange plate through the inner self-locking block and the outer self-locking block, ensure the tight connection of the upper flange plate and the lower flange plate, effectively prevent corrosive substances from entering the inside of the flange plates, and realize the symmetrical stress of the tower barrel flange under repeated load, thereby overcoming the lever amplification effect of the traditional wind power flange connection on the stress amplitude under the action of eccentric load, effectively improving the stress behavior of a fastener, and improving the fatigue resistance of the fastener from the action effect aspect.

2. In the utility model, the annular groove rivet is adopted between the upper flange plate and the lower flange plate, the annular groove rivet is designed by adopting special annular groove threads, and the threads are formed by a plurality of independent annular grooves, so that the processing technology is simplified and clear, the processing precision can be effectively improved, and the initial defects can be reduced; and the thread tooth type adopts an arc structural design, the close fit of the ring groove rivet and the lantern ring is realized through extrusion deformation by utilizing a rivet connection technology, the strength, reliability, shock resistance and fatigue performance of a connection part are ensured, and more stable connection support is provided for the tower barrel.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of a rotary self-locking fatigue-resistant wind power flange provided by the utility model;

FIG. 2 is a schematic perspective view of the upper flange of the present invention;

FIG. 3 is a schematic perspective view of a lower flange according to the present invention;

FIG. 4 is a schematic structural view of a ring groove rivet of the present invention;

FIG. 5 is a schematic view of the staggered butt joint of the upper and lower flanges according to the present invention; wherein (a) is a top view; (b) is a sectional view along A-A; (c) is a sectional view along the direction B-B;

FIG. 6 is a schematic view of the rotational self-locking of the upper and lower flanges of the present invention; wherein (a) is a top view; (b) is a sectional view along A-A; (c) is a sectional view along the direction B-B;

FIG. 7 is a schematic illustration of a ring groove rivet installation of the present invention; wherein (a) is a top view; (b) is a sectional view along A-A; (c) is a sectional view along the direction B-B.

In the figure: 1. an upper flange plate; 101. an annular vertical plate; 102. an upper flange plate through hole; 103. an inner locking block; 104. the upper flange plate is in butt joint with the joint; 2. a lower flange plate; 201. an outer locking block; 202. a lower flange plate through hole; 203. a lower flange plate butt joint; 3. a ring groove rivet; 301. tail teeth; 302. a ring groove section; 303. a polished rod segment; 304. a rivet head; 4. a collar.

Detailed description of the preferred embodiments

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in FIG. 1, the rotary self-locking fatigue-resistant wind power flange provided by the utility model comprises an upper flange plate 1, a lower flange plate 2, a ring groove rivet 3 and a lantern ring 4.

As shown in FIG. 2, an annular vertical plate 101 protruding downwards is arranged on the outer side of the upper flange 1, inner locking blocks 103 are arranged on the annular vertical plate 101, the inner locking blocks 103 are distributed in an annular direction, and the protruding height of the annular vertical plate 101 is the same as that of the lower flange 2. As shown in fig. 3, the outer side of the lower flange plate 2 is provided with an outer locking block 201 matched with the inner locking block 103 of the upper flange plate 1, wherein the inner locking block 103 and the outer locking block are distributed in a staggered manner in the axial direction in order to realize self-locking, and as shown in the figure, the two layers of inner locking blocks and the two layers of outer locking blocks are engaged in a staggered manner, are mutually independent in the radial direction, can rotate, and are mutually limited in the axial direction to realize self-locking.

In this embodiment, the inner and outer locking blocks are formed by rolling, and the upper and lower flanges are welded to the wind turbine tower through the upper flange butt joint 104 and the lower flange butt joint 203, respectively. Meanwhile, through holes are uniformly formed in the upper flange plate 1 and the lower flange plate 2 along the circumferential direction of the upper flange plate and the lower flange plate for mounting the ring groove rivets 3, and the positions of the upper flange plate through holes 102 are matched with those of the lower flange plate through holes 202.

As shown in FIG. 4, the ring groove rivet 3 includes a tail tooth 301, a ring groove section 302, a polish rod section 303, and a rivet head 304. As shown in fig. 7(a), (b), and (c), when the ring groove rivet 3 is used to integrally mount the upper flange 1 and the lower flange 2, the polish rod section 303 of the ring groove rivet 3 penetrates the upper flange 1 and the lower flange 2, so that the ring groove section 302 is located at the upper part of the upper flange 1, the muzzle of the rivet gun is inserted into the tail tooth 301, so that the rivet gun is engaged with the tail tooth 301 by the thread, and then the ring groove rivet 3 is axially stretched and pressed by the rivet gun, so that the metal of the inner diameter of the ring 4 flows into the ring groove section 302, and a permanent metal plastic connection is formed; the pre-tensioning load is continuously applied through the rivet gun, so that the preset necking section of the tail tooth 301 is automatically broken, the pre-tensioning force is transferred to the ring groove rivet 3 through the rivet gun, and the anchoring process is completed. Meanwhile, the ring groove rivets 3 can be selected from different models according to the environment and the working condition of the tower drum to meet the design requirements, the fatigue life of the flange is prolonged better, and the failure risk of the tower drum is reduced. The ring groove rivet 3 adopts a special ring groove thread design, and the thread is formed by a plurality of independent ring grooves, so that the processing technology is simplified and clear, the processing precision can be effectively improved, and the initial defect can be reduced; and the thread tooth type adopts an arc structural design, the ring groove rivet is tightly matched with the lantern ring through extrusion deformation by utilizing a rivet connection technology, the strength, reliability, shock resistance and fatigue performance of a connection part are ensured, and more stable connection support is provided for the tower barrel.

And (3) carrying out staggered butt joint on the upper flange plate and the lower flange plate, namely, putting down the upper flange plate 1 to the plane of the lower flange plate 2 as shown in fig. 5(a), adjusting the upper flange plate 1 according to the position of the locking block to carry out staggered butt joint as shown in fig. 5(b) and (c), and ensuring that two end faces of the flange plates are tightly attached. The upper and lower flanges are self-locked by rotation, as shown in fig. 6(a), the outer locking block 201 outside the lower flange 2 is rotatably embedded into the inner locking block 103 in the upper flange 1, as shown in fig. 6(b) and (c), so that the lower flange 2 and the upper flange 1 in the rotary self-locking flange structure are self-locked integrally, the tight connection of the upper and lower flanges is ensured, and corrosive substances are effectively prevented from entering the inside of the flange. Through self-locking connection, the symmetric stress of the tower barrel flange under repeated load can be realized, so that the lever amplification effect of the traditional wind power flange connection on the stress amplitude under the action of eccentric load is overcome, the stress behavior of a fastener is effectively improved, and the fatigue resistance of the fastener is improved from the action effect aspect.

Meanwhile, the rivet connection technology is adopted, the overall fatigue resistance and the anti-loosening performance of the tower barrel are improved, and the anti-delayed fracture capability is enhanced, so that the overall service life of the lower flange plate 2 and the upper flange plate 1 is remarkably prolonged, and the failure risk of the tower barrel is effectively reduced.

Claims (4)

1. A rotary self-locking type anti-fatigue wind power flange comprises an upper flange plate and a lower flange plate; the method is characterized in that: an annular vertical plate is arranged on the outer side of the upper flange plate and protrudes downwards; the inner wall of the protruding part is circumferentially provided with an inner locking block, and the outer side of the lower flange plate is provided with an outer locking block matched with the inner locking block; the inner locking blocks and the outer locking blocks are distributed in an staggered mode in the axial direction.

2. The rotary self-locking type anti-fatigue wind power flange according to claim 1, characterized in that: through holes are uniformly formed in the upper flange plate and the lower flange plate along the circumferential direction of the upper flange plate and the lower flange plate; and a rivet penetrates through the through hole to connect and fix the upper flange plate and the lower flange plate.

3. The rotary self-locking type anti-fatigue wind power flange according to claim 2, characterized in that: the rivet is an annular groove rivet and is divided into a rivet head, a polished rod section, an annular groove section and a tail tooth; the tail tooth section is provided with a necking section.

4. The rotary self-locking type anti-fatigue wind power flange according to claim 3, characterized in that: the ring groove rivet is assembled with the ring sleeve in a pulling rivet mode.

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