Transformation node of lattice type tower

Abstract

The utility model relates to a switching node of a lattice type tower, which belongs to the field of lattice type tower structures and comprises an arc-shaped connecting body. The first flange is arranged at the first connecting end of the arc-shaped connecting body; the multiple casting parts are arranged at intervals in the circumferential direction of the second connecting end of the arc-shaped connecting body, and a second flange is arranged at the end, away from the arc-shaped connecting body, of each casting part; the first cross rod supporting mechanism comprises a plurality of first cross beams, one end of each first cross beam is connected with the side, close to the arc-shaped connecting body, of one casting part, and the other end of each first cross beam is connected with the side, close to the arc-shaped connecting body, of the other casting part. Compared with the prior art, the whole stress path is simple and clear, and the space is enlarged from small; and in a complex stress area, residual stress caused by a large amount of welding is avoided by using the casting part, and the purposes of safety, reliability and better economical efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of lattice tower structures, in particular to a conversion node of a lattice tower. Background Art

[0002] As a clean and renewable energy source, wind energy has attracted much attention due to its wide distribution, abundant reserves, safety and reliability. Wind power generation is one of the most mature new energy technologies. The tower, as an important load-bearing component connecting the nacelle and the foundation, is responsible for safely and reliably transferring the wind turbine load to the foundation. The load is getting bigger and bigger. At the same time, in order to avoid the resonance range of the wind turbine, higher requirements are placed on the load-bearing capacity and stiffness of the tower. The current traditional single-tube tower structure is limited by transportation conditions and can only deal with strength and resonance problems by increasing the wall thickness to improve strength and stiffness, which greatly increases construction and transportation costs. The current single-tube concrete tower requires high-cost molds, and wind farm accessories need to be prefabricated in a factory. At the same time, subjective factors have a greater impact on construction quality.

[0003] Relatively speaking, the lattice tower uses a spatial structure design, the components are small in size, easy to transport, and the construction quality is relatively reliable. The problem of large loads and stiffness can be solved by increasing the structural space and using less material, but the lattice tower requires many components to be assembled and the on-site installation is complicated. In actual projects, the full lattice structure from top to bottom, or the combination of the upper single-tube tower and the lower lattice tower can be used according to the actual project requirements. Whether it is a full lattice tower or a combined lattice tower, it is necessary to transfer the load from the tubular structure to the multi-column lattice structure through the conversion node.

[0004] The conversion nodes of existing lattice towers are mostly large-sized structures, which restrict transportation. Moreover, as the load becomes larger and larger, the existing lattice towers have limited bearing capacity and fatigue life, which makes it impossible to guarantee the normal operation of wind turbines. Utility Model Content

[0005] The purpose of the utility model is to provide a conversion node of a lattice tower in order to overcome at least one of the defects of the above-mentioned prior art. The overall force path of the conversion node is simple and clear, and the space is expanded from small to large; in the complex force area, the use of casting parts avoids the residual stress caused by a large amount of welding, achieving the purpose of safety, reliability and economical.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A conversion node of a lattice tower, comprising:

[0008] Arc connector;

[0009] A first flange disposed at a first connecting end of the arc-shaped connecting body;

[0010] A plurality of casting components are arranged at intervals along the circumferential direction of the second connecting end of the arc-shaped connecting body, and a second flange is arranged at one end of each casting component away from the arc-shaped connecting body;

[0011] The first crossbar support mechanism comprises a plurality of first crossbeams, one end of each of the first crossbeams is connected to one side of the casting component close to the arc-shaped connector, and the other end is connected to one side of another casting component close to the arc-shaped connector.

[0012] Furthermore, the arc connector is composed of a plurality of arc connector segments; a longitudinal flange is provided on the connecting side of each arc connector segment, and two adjacent arc connector segments are connected into a whole by bolts screwed into two longitudinal flanges abutting each other.

[0013] Furthermore, the arc-shaped connector is a rolled steel plate. Specifically, the rolled steel plate is rolled in a whole circle; the flange is welded with the rolled plate and the casting. If the transportation size exceeds the requirement, the whole circle is cut into multiple pieces, such as 3 pieces, 4 pieces, or even more pieces for transportation. A longitudinal flange is welded on the connection side of each rolled plate.

[0014] Furthermore, the arc-shaped connector is in a truncated cone shape, and the diameter of the arc-shaped connector gradually decreases from the second connecting end of the arc-shaped connector to the first connecting end of the arc-shaped connector.

[0015] Furthermore, the first flange is a forged flange.

[0016] More specifically, the forged flange is fixedly welded to the rolled steel plate; and the rolled steel plate is fixedly welded to the cast component.

[0017] Furthermore, the conversion node is also provided with a second crossbar support mechanism, including a plurality of second crossbeams, one end of each second crossbeam is connected to one side of the casting component close to the second flange, and the other end is connected to one side of another casting component close to the second flange.

[0018] Furthermore, the casting component is a cavity casting. Specifically, the casting component can avoid stress concentration, has good mechanical properties and practicality, and reduces the difficulty of factory processing and on-site construction. Different cast steel or cast iron materials are used for casting, and corresponding flanges and connecting plates are set according to the connecting rods required by the actual project. The cast steel component is provided with a cavity as a whole, which reduces the difficulty of processing large-size castings and improves the integrity of the structure to cope with applications in larger load scenarios.

[0019] Furthermore, the conversion node is also provided with a plurality of lattice tower columns, and the ends of the lattice tower columns are provided with third flanges, which are connected by bolts screwed into the second flange and the third flange. Specifically, the plurality of lattice tower columns constitute a steel structure member, and in order to improve the integrity of the node area, enhance the rigidity and load-bearing capacity, a crossbeam or diagonal brace connecting the various casting components is provided.

[0020] Furthermore, a third cross beam is provided between two adjacent lattice tower columns.

[0021] Furthermore, the conversion node is also provided with a plurality of diagonal braces; one end of the diagonal brace is connected to the casting component, and the other end is connected to the third crossbeam.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] (1) The advantages of forging, rolling and casting are fully combined to avoid the limitations of the three production processes. The transition section, that is, the area formed by the arc-shaped connector and the casting component, has a simple and clear overall force path, and the space is expanded from small to large. In the complex force area, the use of casting components avoids the residual stress caused by a large amount of welding, achieving the purpose of safety, reliability and economical optimization.

[0024] (2) By dividing the forged flange and rolled steel plate as needed and connecting them into a whole by splicing, the design restriction of limited transportation of large-size structures can be effectively avoided;

[0025] (3) The conversion node is connected to the upper structure and the lower lattice structure by bolts, which can be manufactured in the factory according to design requirements and installed on site with high accuracy and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a conversion node of a lattice tower in the utility model;

[0027] Figure 2 It is a cross-sectional view of a conversion node of a lattice tower in the utility model;

[0028] Figure 3 It is a schematic diagram of a transition section of a conversion node of a lattice tower in the utility model;

[0029] Figure 4 It is a bottom view of a conversion node of a lattice tower in the utility model;

[0030] As shown in the figure, the numbers are as follows: 1-first flange; 2-arc-shaped connector; 3-casting component; 4-longitudinal flange; 5-first crossbeam; 6-second crossbeam; 7-third flange; 8-second flange; 9-lattice tower column; 10-diagonal brace; 11-third crossbeam. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0032] Example 1

[0033] See also Figure 1-4 This embodiment provides a conversion node of a lattice tower, including:

[0034] The arc-shaped connector 2 is preferably made of rolled steel plate;

[0035] A first flange 1 provided at a first connection end of the arc-shaped connector 2 is preferably a forged flange, and is bolted to the yaw system or the upper single-tube tower through the first flange 1;

[0036] A plurality of casting parts 3 are arranged at intervals along the second connecting end of the arc-shaped connecting body 2 in the circumferential direction, preferably are cavity castings, and a second flange 8 is arranged at one end of each casting part 3 away from the arc-shaped connecting body 2;

[0037] The first crossbar support mechanism includes a plurality of first crossbeams 5 , one end of each of the first crossbeams 5 is connected to one side of the casting component 3 close to the arc-shaped connector 2 , and the other end is connected to one side of another casting component 3 close to the arc-shaped connector 2 .

[0038] Please see again Figure 1-2 In this embodiment, the arc-shaped connector 2 is in a truncated cone shape, and the diameter of the arc-shaped connector 2 gradually decreases from the second connecting end of the arc-shaped connector 2 to the first connecting end of the arc-shaped connector 2.

[0039] Please see again Figure 1-2 In this embodiment, the conversion node is also provided with a second cross bar support mechanism, including a plurality of second cross beams 6, one end of each of the second cross beams 6 is connected to one side of the casting component 3 near the second flange 8, and the other end is connected to one side of another casting component 3 near the second flange 8.

[0040] Please see again Figure 1-2 In this embodiment, the conversion node is further provided with a plurality of lattice tower columns 9, and a third flange 7 is provided at the end of the lattice tower column 9, which is connected by bolts screwed into the second flange 8 and the third flange 7.

[0041] Please see again Figure 4In this embodiment, a third cross beam 11 is provided between two adjacent lattice tower columns 9. The conversion node is further provided with a plurality of diagonal braces 10; one end of the diagonal brace 10 is connected to the casting component 3, and the other end is connected to the third cross beam 11.

[0042] This embodiment provides a conversion node of a lattice wind power tower, which connects an upper single-tube tower structure and a lower lattice structure by bolts.

[0043] The specific installation process is as follows:

[0044] It is connected to the lower part of the single-tube tower structure through the first flange 1, and is connected to the third flange 7 arranged on the top of the column of the lattice structure through the second flange 8 arranged on the casting component 3. A connecting flange / connecting plate is arranged on the top of the lattice tower diagonal brace 10; a connecting piece is arranged at the conversion node casting component 3, and the connecting piece is connected to the crossbeam 6 by bolts.

[0045] After the lattice tower is hoisted, the conversion node is hoisted as a whole, and the conversion node and the lattice tower are connected by bolts; after adjustment into place, the upper section of the single-tube tower is hoisted and installed using flange bolts.

[0046] Example 2

[0047] If the transport size exceeds the requirement, the conversion node can be transported to the site in pieces and then the pieces can be assembled into a whole using bolts.

[0048] This embodiment is basically the same as Embodiment 1, except that: in this embodiment, the arc connector 2 is composed of a plurality of arc connector segments, preferably 4 arc connector segments; each arc connector segment is provided with a longitudinal flange 4 on the connecting side, and two adjacent arc connector segments are connected into a whole by bolts screwed into the two longitudinal flanges 4 that abut each other.

[0049] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A conversion node of a lattice tower, characterized in that: include: Arc-shaped connector (2); A first flange (1) provided at a first connection end of the arc-shaped connecting body (2); A plurality of casting components (3) are arranged at intervals along the circumferential direction of the second connection end of the arc-shaped connecting body (2), and a second flange (8) is arranged at one end of each casting component (3) facing away from the arc-shaped connecting body (2); The first crossbar support mechanism comprises a plurality of first crossbeams (5), one end of each of the first crossbeams (5) being connected to one side of the casting component (3) close to the arc-shaped connector (2), and the other end being connected to one side of another casting component (3) close to the arc-shaped connector (2).

2. A conversion node of a lattice tower according to claim 1, characterized in that: The arc-shaped connector (2) is composed of a plurality of arc-shaped connector segments; A longitudinal flange (4) is provided on the connection side of each arc-shaped connector segment, and two adjacent arc-shaped connector segments are connected into a whole by bolts screwed into two longitudinal flanges (4) that abut against each other.

3. A conversion node of a lattice tower according to claim 1, characterized in that: The arc-shaped connecting body (2) is a rolled steel plate.

4. A conversion node of a lattice tower according to claim 1, characterized in that: The arc-shaped connector (2) is in the shape of a truncated cone, and the diameter of the arc-shaped connector (2) gradually decreases from the second connecting end of the arc-shaped connector (2) to the first connecting end of the arc-shaped connector (2).

5. A conversion node of a lattice tower according to claim 1, characterized in that: The first flange (1) is a forged flange.

6. A conversion node of a lattice tower according to claim 1, characterized in that: The conversion node is also provided with a second crossbar support mechanism, comprising a plurality of second crossbeams (6), one end of each of the second crossbeams (6) being connected to one side of the casting component (3) close to the second flange (8), and the other end being connected to one side of another casting component (3) close to the second flange (8).

7. A conversion node of a lattice tower according to claim 1, characterized in that: The casting component (3) is a cavity casting.

8. A conversion node of a lattice tower according to claim 1, characterized in that: The conversion node is also provided with a plurality of lattice tower columns (9), and the ends of the lattice tower columns (9) are provided with third flanges (7), which are connected by bolts screwed into the second flange (8) and the third flange (7).

9. A conversion node of a lattice tower according to claim 8, characterized in that: A third cross beam (11) is arranged between two adjacent lattice tower columns (9).

10. A conversion node of a lattice tower according to claim 9, characterized in that: The conversion node is also provided with a plurality of diagonal braces (10); One end of the diagonal brace (10) is connected to the casting component (3), and the other end is connected to the third crossbeam (11).

Images