Recoverable hybrid energy dissipation connecting node for wind power tower drum

Abstract

The invention relates to the technical field of wind power tower tube structure engineering, in particular to a recoverable mixed energy dissipation connecting joint for a wind power tower tube. The self-recovery tower drum comprises a tower drum section, a friction energy dissipation assembly and a self-recovery assembly. The friction energy dissipation assembly comprises a plurality of friction sets, each friction set comprises a variable cross-section stiffening plate assembly and a pair of friction clamping blocks, the friction clamping blocks and the variable cross-section stiffening plate assemblies are connected through first bolt pairs, the self-recovery assembly comprises a plurality of recovery sets, and each recovery set comprises an elastic piece and a second bolt pair. The recovery sets and the energy dissipation sets are evenly arranged in the circumferential direction of the tower drum at intervals and jointly connected with the upper tower drum section and the lower tower drum section. Through the synergistic effect of the friction energy dissipation assembly and the self-recovery assembly, the hybrid energy dissipation and self-recovery effects are achieved, the energy dissipation capacity and anti-seismic performance of the wind power tower barrel connecting joint are improved, and the stability and durability of the structure are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of wind power tower structure engineering, and in particular to a recoverable hybrid energy dissipation connection node for a wind power tower. Background Art

[0002] At present, wind turbine towers are mostly connected by flanges, and the upper and lower flanges are connected by bolts to achieve the splicing of tower sections, which has the advantages of simple structure and convenient construction. However, during operation, wind power structures are subjected to large vibration loads, wind and wave loads, and earthquakes. Under the action of long-term alternating loads, the tower connection parts are prone to fatigue fracture failure of the bolts at the flange connection and loosening caused by vibration, which may cause a series of engineering accidents. Traditional flange connections are difficult to meet the requirements of structural deformation capacity and energy dissipation capacity, which may cause structural failure and cause large economic losses.

[0003] Therefore, the present invention proposes a recoverable hybrid energy dissipation connection node for a wind turbine tower to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a recoverable hybrid energy dissipation connection node for a wind turbine tower to solve the problem of structural damage caused by insufficient energy dissipation and deformation capacity of the wind turbine tower connection node in the prior art.

[0005] (II) Technical solution In order to achieve the above-mentioned object, the present invention provides a recoverable hybrid energy dissipation connection node for a wind power tower, comprising a tower section, a friction energy dissipation component and a self-recovery component, wherein: The tower section is formed by splicing an upper tower section and a lower tower section, and the upper tower section and the lower tower section form a connection surface at the butt joint; an upper connection flange perpendicular to the axial direction of the tower section is arranged on the side wall of the upper tower section, and a lower connection flange perpendicular to the axial direction of the tower section is arranged on the side wall of the lower tower section; The friction energy dissipation assembly includes a plurality of friction groups arranged along the circumferential direction at the connection surface, each of the friction groups includes a variable-section stiffening plate assembly and a pair of friction clamps arranged along the axial direction, wherein: The variable-section stiffening plate assembly is formed by splicing an upper variable-section stiffening plate and a lower variable-section stiffening plate, wherein the upper variable-section stiffening plate is fixed to the side wall of the upper tower section and its lower end face is flush with the connecting face, and the lower variable-section stiffening plate is fixed to the side wall of the lower tower section and its upper end face is flush with the connecting face; the shape of the clamping surface of the friction clamping block matches the clamped surface of the variable-section stiffening plate assembly, and a vertical oblong hole is provided at the variable section; mounting holes corresponding to the oblong holes are provided on both friction clamping blocks; the friction clamping block cooperates with the mounting hole and the oblong hole through a first bolt pair to clamp the variable-section stiffening plate assembly; The self-restoring assembly includes a plurality of restoring groups arranged circumferentially at the connection surface, each of the restoring groups includes a second bolt pair and an elastic member, the upper connection flange and the lower connection flange are provided with connection holes corresponding to the restoring group, the elastic member is sleeved on the screw of the second bolt pair and abuts against the fastener of the first bolt pair and the upper connection flange and / or the lower connection flange; The recovery group and the friction group are arranged at intervals along the circumferential direction.

[0006] Preferably, the recovery group and the friction group are evenly spaced apart along the circumference of the tower section at the connection surface, and jointly connect the upper tower section and the lower tower section.

[0007] Preferably, the upper variable-section stiffening plate and the lower variable-section stiffening plate are provided with rectangular filling grooves at the butt surfaces for filling with viscoelastic material.

[0008] Preferably, the thickness of the upper variable-section stiffening plate and the lower variable-section stiffening plate gradually increases at the connecting surface; the friction clamp is a wedge-shaped friction block, and the shape of its clamping surface is V-shaped in cross section near the connecting surface.

[0009] Preferably, the oblong holes are opened at the variable cross-sections of the upper variable cross-section stiffening plate and the lower variable cross-section stiffening plate.

[0010] Preferably, the elastic member is a disc spring group, and the disc spring group is a plurality of shape memory alloy disc springs arranged in series.

[0011] Preferably, the upper end of the upper variable-section stiffening plate is fixedly connected to the upper connecting flange, the lower end of the lower variable-section stiffening plate is fixedly connected to the lower connecting flange, and the upper variable-section stiffening plate and the lower variable-section stiffening plate are butt-jointedly arranged.

[0012] Preferably, the oblong holes are horizontally symmetrically distributed on the upper variable-section stiffening plate and the lower variable-section stiffening plate.

[0013] Preferably, the number of the oblong holes of each of the variable-section stiffening plate assemblies is four, and the oblong holes are horizontally distributed in pairs on the upper variable-section stiffening plate and the lower variable-section stiffening plate.

[0014] Preferably, one end of the disc spring group abuts against the fastener of the second bolt pair, and the other end abuts against the upper connecting flange.

[0015] (III) Beneficial effects A recoverable hybrid energy dissipation connection node for a wind turbine tower of the present invention has a hybrid energy dissipation effect. The shape memory alloy disc spring in the self-recovering component can absorb and dissipate energy through its own elastic deformation, and the friction energy dissipation component can perform friction energy dissipation through relative sliding between the friction clamp and the variable-section stiffening plate component.

[0016] The present invention also has a self-recovery effect. The shape memory alloy disc spring can deform and dissipate energy when absorbing energy. After the external force is removed, it can quickly recover to the initial state based on the material properties, thereby effectively reducing the residual deformation of the structure. The present invention also has an anti-fatigue effect. The viscoelastic material filler can absorb vibration energy and significantly reduce the impact of vibration transmitted to other parts of the tower. The vibration reduction characteristics of the viscoelastic material filler can reduce fatigue damage to connection nodes. Elastic parts such as shape memory alloy disc springs can also effectively alleviate fatigue damage caused by long-term alternating loads on bolts at the connection.

[0017] In summary, the present invention effectively solves the problem in the prior art that the tower connection nodes are damaged due to insufficient energy dissipation capacity and deformation capacity, and significantly improves the safety and durability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a recoverable hybrid energy dissipation connection node for a wind power tower in one embodiment of the present invention; Figure 2 for Figure 1 A main view of a recoverable hybrid energy dissipation connection node for a wind power tower; Figure 3 for Figure 2 Sectional view along AA; Figure 4 It is a structural schematic diagram of the tower section of the present invention; Figure 5 It is a structural schematic diagram of the recovery group of the present invention; Figure 6 It is a structural schematic diagram of the friction group of the present invention; Figure 7 It is an exploded view of the friction group of the present invention.

[0019] [Description of Reference Numerals] 1: tower section; 11: upper tower section; 1101: upper connecting flange; 12: lower tower section; 1201: lower connecting flange; 13: connecting hole; 2: friction group; 21: variable cross-section stiffening plate assembly; 2101: upper variable cross-section stiffening plate; 2102: lower variable cross-section stiffening plate; 2103: oblong hole; 2104: viscoelastic material; 22: friction clamp; 2201: mounting hole; 23: first bolt pair; 3: Restoration group; 31: Second bolt pair; 32: Elastic member. DETAILED DESCRIPTION

[0020] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figures 1 to 7 A recoverable hybrid energy dissipation connection node for a wind power tower of the present invention comprises: a tower section 1, a friction energy dissipation component and a self-recovery component, wherein: The tower section 1 is formed by splicing an upper tower section 11 and a lower tower section 12, wherein the upper tower section 11 and the lower tower section 12 form a connection surface at the butt joint; an upper connection flange 1101 perpendicular to the axial direction of the tower section 1 is provided on the side wall of the upper tower section 11, and a lower connection flange 1201 perpendicular to the axial direction of the tower section 1 is provided on the side wall of the lower tower section 12; The friction energy dissipation assembly includes a plurality of friction groups 2 arranged along the circumferential direction at the connection surface, each of the friction groups 2 includes a variable-section stiffening plate assembly 21 and a pair of friction clamps 22 arranged along the axial direction, wherein: The variable-section stiffening plate assembly 21 is formed by splicing an upper variable-section stiffening plate 2101 and a lower variable-section stiffening plate 2102. The upper variable-section stiffening plate 2101 is fixed on the side wall of the upper tower section 11 and its lower end face is flush with the connecting face. The lower variable-section stiffening plate 2102 is fixed on the side wall of the lower tower section 12 and its upper end face is flush with the connecting face. The shape of the clamping surface of the friction clamp 22 matches the clamped surface of the variable-section stiffening plate assembly 21, and a vertical oblong hole 2103 is provided at the variable section. Both friction clamps 22 are provided with mounting holes 2201 corresponding to the oblong holes 2103. The friction clamp 22 cooperates with the mounting holes 2201 and the oblong holes 2103 through a first bolt pair 23 to clamp the variable-section stiffening plate assembly 21. The self-recovering component includes several recovery groups 3 arranged circumferentially at the connection surface, each of the recovery groups 3 includes a second bolt pair 31 and an elastic member 32, and connection holes 13 corresponding to the recovery groups 3 are provided on the upper connecting flange 1101 and the lower connecting flange 1201. The elastic member 32 is sleeved on the screw of the second bolt pair 31 and abuts against the fastener of the first bolt pair 23 and the upper connecting flange 1101 and / or the lower connecting flange 1201.

[0025] The recovery group 3 and the friction group 2 are arranged at intervals along the circumferential direction.

[0026] The recovery group 3 and the friction group 2 are arranged at intervals along the circumferential direction of the connection surface, and jointly connect the upper tower section 11 and the lower tower section 12; the friction energy dissipation component adopts a geometric self-locking friction pair composed of a variable-section stiffening plate assembly 21 and a friction clamp 22 to realize the friction energy dissipation function.

[0027] When the force applied to the tower section 1 exceeds the starting friction force between the variable cross-section stiffening plate assembly 21 and the friction clamp 22, the relative slip between the two is activated, and energy is absorbed and dissipated through friction. The elastic member 32 can absorb and dissipate external energy through its own elastic deformation, thereby enhancing the energy dissipation capacity of the entire structure. The friction energy dissipation of the friction energy dissipation assembly and the deformation energy dissipation of the recovery assembly together achieve mixed energy dissipation.

[0028] The oblong hole 2103 is a common hole type in mechanical structures, usually referring to a long hole (similar to a "racetrack") with semicircular ends and two parallel straight lines in the middle. In a motion mechanism, the oblong hole 2103 can provide displacement space for moving parts to avoid jamming or excessive wear.

[0029] Preferably, the recovery group 3 and the friction group 2 are evenly spaced along the circumference of the tower section 1 at the connection surface, and jointly connect the upper tower section 11 and the lower tower section 12; the self-recovery component provides a restoring force through the elastic member 32 to realize the deformation energy dissipation and self-recovery functions, and preferably connects the upper connection flange 1101 and the lower connection flange 1201. In a specific embodiment, the number of the recovery group 3 and the friction group 2 can be set according to actual engineering needs.

[0030] The staggered arrangement enables the two mechanisms to be activated independently at different circumferential positions, avoiding overlapping of energy absorption paths, and achieving energy dissipation superposition and uniform stress distribution in the spatial dimension; and the manner in which the recovery group 3 and the friction group 2 are arranged at intervals along the circumferential direction can reduce stress concentration, and disperse the internal force of the connection node to different functional components through multi-path load transfer.

[0031] Preferably, the upper variable-section stiffening plate 2101 and the lower variable-section stiffening plate 2102 are provided with rectangular filling grooves (not numbered in the figure) at the butt surfaces for filling with viscoelastic material 2104 .

[0032] The viscoelastic material 2104 can absorb vibration energy and significantly reduce the impact of vibration transmitted to other parts of the tower. The vibration reduction characteristics of the viscoelastic material 2104 can reduce fatigue damage of the connection nodes, thereby significantly improving the fatigue resistance of the tower.

[0033] Preferably, the thickness of the upper variable cross-section stiffening plate 2101 and the lower variable cross-section stiffening plate 2102 gradually increases at the connection surface; the friction clamp 22 is a wedge-shaped friction block, and the shape of its clamping surface is V-shaped in the cross-section shape near the connection surface. In a more preferred embodiment, the starting threshold of the friction force can be controlled by adjusting the bevel angle of the friction clamp 22, so as to flexibly adapt to the energy dissipation requirements under different working conditions; or, in a more preferred embodiment, the friction clamp 22, the upper variable cross-section stiffening plate 2101 and the lower variable cross-section stiffening plate 2102 are curved surfaces with corresponding shapes, so that the effective contact area can be increased. The curved surface contact expands the contact area of ​​the friction pair from line contact to strip surface contact, and the contact area is increased under the same preload, which can significantly increase the friction energy dissipation of a single slip. The curved surface geometry realizes progressive pressure gradient distribution through the Hertz contact theory, avoids stress concentration at both ends of the plane contact, makes the force distribution uniform, and meets the energy dissipation requirements under different working conditions.

[0034] Preferably, the oblong hole 2103 is provided at the variable section of the upper variable section stiffening plate 2101 and the lower variable section stiffening plate 2102. When the variable section stiffening plate assembly 21 and the friction clamp 22 slide relative to each other, the relative sliding is performed along the oblong hole 2103 direction.

[0035] Furthermore, the elastic member 32 is a disc spring group, which is a plurality of shape memory alloy disc springs arranged in series. Compared with ordinary springs, shape memory alloy disc springs can deform and dissipate energy when subjected to force, and can automatically return to their initial shape under the action of their own material characteristics after unloading, thereby reducing residual deformation and ensuring that the tower connection node automatically resets after deformation; shape memory alloy disc springs can effectively alleviate fatigue damage caused by long-term alternating loads on the bolts at the connection. The elastic member 32 can be other high-elastic springs, etc., which are components that can generate elastic force, and those skilled in the art can select them according to needs.

[0036] Preferably, the upper end of the upper variable-section stiffening plate 2101 is fixedly connected to the upper connecting flange 1101, the lower end of the lower variable-section stiffening plate 2102 is fixedly connected to the lower connecting flange 1201, and the upper variable-section stiffening plate 2101 and the lower variable-section stiffening plate 2102 are butt-jointedly arranged with each other.

[0037] In this embodiment, the number of the oblong holes 2103 of each of the variable-section stiffening plate assemblies 21 is four, and the oblong holes 2103 are horizontally distributed in pairs on the upper variable-section stiffening plate 2101 and the lower variable-section stiffening plate 2102. In specific implementation, the number of the oblong holes 2103 can be determined according to actual engineering requirements.

[0038] Preferably, the oblong holes 2103 are horizontally symmetrically distributed on the upper variable-section stiffening plate 2101 and the lower variable-section stiffening plate 2102 .

[0039] Furthermore, the number of the oblong holes 2103 of each of the variable-section stiffening plate assemblies 21 is four, and the oblong holes 2103 are horizontally distributed in pairs on the upper variable-section stiffening plate 2101 and the lower variable-section stiffening plate 2102 .

[0040] The variable-section stiffening plate assembly 21 configured as described above can withstand a larger load; in a more preferred embodiment, the number of the oblong holes 2103 of the variable-section stiffening plate assembly 21 is eight, and the number of corresponding first bolt pairs 23 and mounting holes 2201 on the friction clamp 22 also increases accordingly. When the tightening torque of the first bolt pairs 23 is the same, more first bolt pairs 23 can provide more locking force, thereby improving the load-bearing capacity.

[0041] In a more preferred embodiment, the preload force can be increased by increasing the tightening torque during installation of the first bolt pair 23, thereby increasing the positive pressure between the friction clamp 22 and the variable-section stiffening plate assembly 21, thereby increasing the friction resistance between the components to consume energy, and at the same time, the connection strength of the node can be increased.

[0042] Preferably, one end of the disc spring group abuts against the fastener of the second bolt pair 31, and the other end abuts against the upper connection flange 1101. The shape memory alloy disc spring arranged as above can withstand a higher load than an independently arranged shape memory alloy disc spring; the shape memory alloy disc spring group arranged as above is convenient for installation and can also reduce the possibility of corrosion of the shape memory alloy disc spring group in adverse conditions.

[0043] A recoverable hybrid energy dissipation connection node for a wind turbine tower solves the problem in the prior art of tower connection nodes being damaged due to insufficient energy dissipation and deformation capabilities, thereby significantly improving the safety and durability of the structure.

[0044] It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but the present invention is not limited to the above specific implementation methods. Any changes or modifications made within the scope of the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. A recoverable hybrid energy dissipation connection node for a wind power tower, characterized in that: It includes tower sections, friction energy dissipation components and self-recovery components, among which: The tower section is formed by splicing an upper tower section and a lower tower section, and the upper tower section and the lower tower section form a connection surface at the butt joint; an upper connection flange perpendicular to the axial direction of the tower section is arranged on the side wall of the upper tower section, and a lower connection flange perpendicular to the axial direction of the tower section is arranged on the side wall of the lower tower section; The friction energy dissipation assembly includes a plurality of friction groups arranged along the circumferential direction at the connection surface, each of the friction groups includes a variable-section stiffening plate assembly and a pair of friction clamps arranged along the axial direction, wherein: The variable-section stiffening plate assembly is formed by splicing an upper variable-section stiffening plate and a lower variable-section stiffening plate, wherein the upper variable-section stiffening plate is fixed to the side wall of the upper tower section and its lower end face is flush with the connecting face, and the lower variable-section stiffening plate is fixed to the side wall of the lower tower section and its upper end face is flush with the connecting face; the shape of the clamping surface of the friction clamping block matches the clamped surface of the variable-section stiffening plate assembly, and a vertical oblong hole is provided at the variable section; mounting holes corresponding to the oblong holes are provided on both friction clamping blocks; the friction clamping block cooperates with the mounting hole and the oblong hole through a first bolt pair to clamp the variable-section stiffening plate assembly; The self-restoring assembly includes a plurality of restoring groups arranged circumferentially at the connection surface, each of the restoring groups includes a second bolt pair and an elastic member, the upper connection flange and the lower connection flange are provided with connection holes corresponding to the restoring group, the elastic member is sleeved on the screw of the second bolt pair and abuts against the fastener of the first bolt pair and the upper connection flange and / or the lower connection flange; The recovery group and the friction group are arranged at intervals along the circumferential direction.

2. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The recovery group and the friction group are evenly spaced apart along the circumference of the tower section at the connection surface, and jointly connect the upper tower section and the lower tower section.

3. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The upper variable-section stiffening plate and the lower variable-section stiffening plate are provided with rectangular filling grooves at the joints for filling viscoelastic material.

4. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The thickness of the upper variable-section stiffening plate and the lower variable-section stiffening plate gradually increases at the connection surface; the friction clamp is a wedge-shaped friction block, and the shape of its clamping surface is V-shaped in cross section near the connection surface.

5. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The oblong holes are arranged at the variable cross-section locations of the upper variable cross-section stiffening plate and the lower variable cross-section stiffening plate.

6. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The elastic member is a disc spring group, and the disc spring group is a plurality of shape memory alloy disc springs arranged in series.

7. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The upper end of the upper variable-section stiffening plate is fixedly connected to the upper connecting flange, the lower end of the lower variable-section stiffening plate is fixedly connected to the lower connecting flange, and the upper variable-section stiffening plate and the lower variable-section stiffening plate are butt-jointed and arranged with each other.

8. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 1, characterized in that: The oblong holes are horizontally and symmetrically distributed on the upper variable-section stiffening plate and the lower variable-section stiffening plate.

9. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 8, characterized in that: The number of the oblong holes of each variable-section stiffening plate assembly is four, and the oblong holes are horizontally distributed in pairs on the upper variable-section stiffening plate and the lower variable-section stiffening plate.

10. A recoverable hybrid energy dissipation connection node for a wind power tower according to claim 6, characterized in that: One end of the disc spring group abuts against the fastener of the second bolt pair, and the other end abuts against the upper connecting flange.

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