A tower frame, a tower section and a method for manufacturing a tower section

Abstract

The present invention relates to a tower, a tower section and a manufacturing method of a tower section, wherein the tower section comprises a barrel and two end flanges respectively arranged at both ends of the barrel; the barrel comprises at least two barrel pieces arranged in the circumferential direction, and two adjacent barrel pieces are connected by a longitudinal flange group arranged in the axial direction of the barrel; the longitudinal flange group comprises a first flange and a second flange respectively welded to the side walls of the two barrel pieces, and only the first flange of the first flange and the second flange is provided with a notch, and the notch can form a clearance space arranged in the axial direction between the longitudinal flange group and the inner wall of the barrel piece. The manufacturing process of the tower section can be simplified, the manufacturing efficiency can be improved and the cost can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation equipment, and in particular to a tower, a tower section and a method for manufacturing the tower section. Background Art

[0002] In a wind turbine, the tower is a component that bears weight, pressure and load. Its structure directly affects the working reliability of the wind turbine. Therefore, in order to ensure the structural strength of the tower, the tower is often huge. The cylindrical tower is a more commonly used tower structure. It is usually formed by connecting multiple tower sections longitudinally. Each tower section is divided into multiple pieces along the circumference for transportation. The pieces can be connected by a longitudinal flange group. The longitudinal flange group includes two longitudinal flanges connected to two adjacent pieces.

[0003] In the prior art, the segmented structures of tower sections are usually divided into the following two types:

[0004] One is that there is a gap between the two longitudinal flanges in each set of longitudinal flanges. When welding each longitudinal flange, it is necessary to weld on both sides of the longitudinal flange separately. After welding, it is necessary to use a trolley with a flame cutting gun to cut the tower section between the two longitudinal flanges. In order to ensure continuous cutting by the cutting trolley, it is necessary to ensure that the forward route of the cutting trolley is unobstructed during the cutting process. At the same time, in order to ensure the integrity of the tower section after the slit, it is necessary to follow the tail of the cutting trolley to connect the longitudinal flanges on both sides of the slit with bolts. During installation, it is necessary to add a spacer between the two longitudinal flanges to ensure that a friction connection pair is formed between the two longitudinal flanges to prevent the bolts from being damaged by shear and the longitudinal flanges from being deformed. The spacer has a high cost.

[0005] The other method is to first cut a longitudinal groove on the inner wall of the tower section, then put the longitudinal flange group into the groove, and weld the longitudinal flange group to the inner and outer walls of the tower section. This solution requires additional tooling before cutting the groove, spanning and connecting the two sides of the side wall of the tower section to be cut, to ensure the integrity of the tower section during the groove cutting process and prevent the long groove from being deformed significantly; and the longitudinal flange needs to be welded on the inner and outer walls of the tower section, which requires a large amount of welding work and takes a long time.

[0006] Therefore, how to simplify the manufacturing process of tower segments, improve manufacturing efficiency and effectively reduce costs is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0007] The object of the present invention is to provide a tower frame, a tower section and a method for manufacturing a tower section, which can simplify the manufacturing process of the tower section, improve the manufacturing efficiency and effectively reduce the cost.

[0008] In order to solve the above technical problems, the present invention provides a tower section, which includes a cylinder and two end flanges respectively arranged at both ends of the cylinder; the cylinder includes at least two cylinder segments arranged along the circumferential direction, and two adjacent cylinder segments are connected by a longitudinal flange group arranged along the axial direction of the cylinder; the longitudinal flange group includes a first flange and a second flange respectively welded to the side walls of the two cylinder segments, and of the first flange and the second flange, only the first flange is provided with a notch, and the notch can form a clearance space arranged along the axial direction between the longitudinal flange group and the inner wall of the cylinder segment.

[0009] After the tower section is cut, the connection of each longitudinal flange group is removed to remove the connection between the two cylinder segments connected by each longitudinal flange group, thereby obtaining at least two cylinder segments in a separated state. The placement height of the cylinder segment (in the direction perpendicular to the axial direction) is lower than the height of the tower section. The cylinder segments can be stacked to reduce the occupied space and ensure stable placement and easy transportation.

[0010] When the cylinder segments are transported to the site, the entire tower needs to be assembled. First, the cylinder segments are connected through the longitudinal flange group to form a tower section, and then the tower sections are assembled in sequence through the end flanges to form a tower. The installation is relatively convenient.

[0011] The existence of the clearance space can ensure that when the tower section is cut from the outside, the longitudinal flange group is not cut by mistake due to the existence of errors such as straightness. In addition, since the clearance space is formed by the notch of the first flange, the first flange and the second flange can fit tightly except for the position of the notch when connected, so that the structure of the longitudinal flange group is more stable, ensuring that the bolts connected between the first flange and the second flange are evenly stressed, and easy to install.

[0012] Since the first flange and the second flange are asymmetric structures, during manufacturing, it is only necessary to set a notch on one flange (the first flange), and there is no need to set notches on both flanges (the first flange and the second flange), thereby simplifying the processing operation and reducing the processing cost.

[0013] Optionally, the thickness of the first flange is greater than the thickness of the second flange.

[0014] Optionally, the notch is provided on a side edge of the first flange facing the second flange and the inner wall of the cylinder sheet.

[0015] Optionally, the first flange and the second flange are fixedly connected by bolts.

[0016] Optionally, the depth and width of the clearance space are not less than 5 mm.

[0017] Optionally, the depth of the clearance space is not less than the width of the clearance space.

[0018] Optionally, the first flange and the inner wall of the cylinder are fixed by full penetration welding or double-sided welding, and the second flange and the inner wall of the cylinder are fixed by full penetration welding or double-sided welding.

[0019] The present invention further provides a tower, which comprises a plurality of tower sections as described above, wherein the tower sections are connected via end flanges.

[0020] The present invention also provides a method for manufacturing a tower segment based on the above tower segment, which comprises the following steps:

[0021] S1: fix two end flanges respectively at two ends of the cylinder to obtain a tower section, and align the identification lines of the two end flanges in the longitudinal direction;

[0022] S2: Welding and fixing the connected longitudinal flange assembly to the inner wall of the cylinder so that the identification line is located in the clearance space of the longitudinal flange assembly;

[0023] S3: Drawing a cutting reference line on the outer wall of the cylinder based on the identification lines of the two end flanges;

[0024] S4: Cutting the tower sections from the outside based on the cutting reference lines respectively;

[0025] S5: removing the connection of the longitudinal flange set to form at least two separated cylinder segments.

[0026] Optionally, in step S1, the end flange is an annular integral flange.

[0027] Optionally, step S11 is further included between step S1 and step S2: drawing an inner reference line on the inner wall of the cylinder based on the identification line; in step S2, the longitudinal yield flange assembly in a connected state is welded and fixed to the inner wall of the cylinder based on the inner reference line, so that the inner reference line is located in the yield space.

[0028] The technical effects of the tower frame having the above-mentioned tower section, and the tower section manufacturing method based on the above-mentioned tower section are similar to the technical effects of the above-mentioned tower section, and will not be described in detail here to save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a tower section provided by an embodiment of the present invention;

[0030] Figure 2-Figure 4 It is a schematic diagram of the structure when the longitudinal flange group is connected to the inner wall of the cylinder;

[0031] Figure 5is a flowchart of a method for manufacturing a tower section provided in an embodiment of the present invention;

[0032] Figure 6 yes Figure 5 Detailed flow chart of the process.

[0033] Attached Figure 1-6 In the figure, the reference numerals are described as follows:

[0034] 1- cylinder, 11- cylinder sheet;

[0035] 2-end flange;

[0036] 3-longitudinal flange set, 31-first flange, 311-notch, 32-second flange, 33-bolt;

[0037] 4- Give space;

[0038] 5- Cutting;

[0039] 61- penetration weld, 62- external weld, 63- internal weld. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] Please refer to Figure 1-6 , Figure 1 is a schematic structural diagram of a tower section provided by an embodiment of the present invention; Figure 2-Figure 4 It is a structural schematic diagram of the longitudinal flange group and the inner wall of the cylinder in the connected state; Figure 5 is a flowchart of a method for manufacturing a tower section provided in an embodiment of the present invention; Figure 6 yes Figure 5 Detailed flow chart of the process.

[0042] The embodiment of the present invention provides a tower, a tower section and a method for manufacturing a tower section, wherein the tower comprises a plurality of tower sections, specifically, Figure 1 As shown, the tower section includes a cylinder 1 and two end flanges 2 respectively arranged at both ends of the cylinder 1, and the end flanges 2 are used to connect with adjacent tower sections, that is, multiple tower sections are connected through the end flanges 2 to form a tower.

[0043] The cylinder 1 includes at least two cylinder pieces 11 arranged in the circumferential direction, and two adjacent cylinder pieces 11 are connected by a longitudinal flange group 3, and the longitudinal flange group 3 is arranged in the axial direction of the cylinder 1. Specifically, the longitudinal flange group 3 includes a first flange 31 and a second flange 32, and the first flange 31 and the second flange 32 are respectively connected to two adjacent cylinder pieces 11, and only the first flange 31 of the first flange 31 and the second flange 32 is provided with a notch 311, and the notch 311 is provided on the side of the first flange 31 facing the side wall of the cylinder piece 11, and can form a clearance space 4 arranged in the axial direction (longitudinal direction) between the longitudinal flange group 3 and the inner wall of the cylinder piece 11. That is to say, the first flange 31 is provided with a notch 311, and the second flange 32 has no notch 311.

[0044] Correspondingly, this embodiment also provides a method for manufacturing a tower segment based on the above tower segment, such as Figure 5 As shown, the manufacturing method of the tower section specifically includes the following steps:

[0045] S1: Two end flanges 2 are respectively fixed to the two ends of each cylinder 1 to obtain a tower section, and the identification lines of the two end flanges 2 are aligned in the longitudinal direction.

[0046] Among them, each end flange 2 is provided with at least two identification lines (the specific number of identification lines of each end flange 2 can be determined according to the number of cylinder pieces 11), and the two end flanges 2 are respectively welded to the two ends of the cylinder 1 and fixed, and the identification lines of the end flanges 2 at both ends of the cylinder 1 are aligned and arranged one by one.

[0047] S2: The longitudinal flange set 3 in the connected state is welded and fixed to the inner wall of the cylinder 11 so that the marking line is located in the clearance space 4 of the longitudinal flange set 3 .

[0048] The longitudinal flange includes a first flange 31 and a second flange 32. The first flange 31 and the second flange 32 are first connected and the longitudinal flange group 3 in a connected state is welded and fixed to the inner wall of the cylinder 1 as a whole, so as to avoid thermal deformation during the welding process, which may cause the two to be unable to be connected later.

[0049] Specifically, when the longitudinal flange group 3 is welded and fixed to the inner wall of the cylinder 1, the identification line of the end flange 2 is aligned with the notch 311 of the longitudinal flange group 3 (the notch 311 of the first flange 31), that is, the extension line of the identification line can be located in the clearance space 4. In this embodiment, the number of the longitudinal flange groups 3 is at least two, and each group of longitudinal flange groups 3 is welded and fixed to the inner wall of the cylinder 1 in the above manner.

[0050] S3: Using the marking lines of the two end flanges 2 as reference, draw a cutting reference line on the outer wall of the cylinder 1.

[0051] The marking lines of the two end flanges 2 are aligned in the longitudinal direction, and then the cutting reference line is drawn on the outer wall of the cylinder 1 based on the marking lines aligned at both ends of the cylinder 1. Since the marking lines are located in the clearance space 4, the cutting reference line also falls within the range of the clearance space 4.

[0052] S4: Cut the tower section from the outside based on each cutting reference line.

[0053] The longitudinal flange group 3 is located on the inner side of the cylinder 1, and the tower section is cut from the outside of the cylinder 1. Since the cutting reference line also falls within the range of the clearance space 4, the longitudinal flange group 3 will not be cut during cutting, and the clearance space 4 can also be used to store cutting debris, facilitating smooth cutting.

[0054] Furthermore, since the tower section is cut from the outside, there are no obstacles along the cutting line path, and continuous cutting operations can be completed along the cutting reference line, with a high degree of automation.

[0055] Cut the tower sections in turn according to each cutting reference line.

[0056] S5: Dismantle the connection of each longitudinal flange group 3 to form at least two separated cylinder segments 11.

[0057] After the tower section is cut, the connection of each longitudinal flange group 3 is removed to remove the connection between the two cylinder segments 11 connected to each longitudinal flange group 3, and at least two cylinder segments 11 in a separated state are obtained. At this time, the ends of each cylinder segment 11 are respectively connected with the cut partial end flange 2. The placement height (in the direction perpendicular to the axial direction) of the cylinder segment 11 is lower than the height of the tower section. The cylinder segments can be stacked to reduce the occupied space and are stable and easy to transport.

[0058] When each cylinder segment 11 is transported to the site, the entire tower needs to be assembled. First, each cylinder segment 11 is connected through the longitudinal flange group 3 to form a tower section, and then each tower section is assembled in sequence through the end flange to form a tower, which is relatively convenient to install.

[0059] In this embodiment, the above-mentioned clearance space 4 is formed by the notch 311 set in the first flange 31. The existence of the clearance space 4 can ensure that when the tower section is cut from the outside, the longitudinal flange group 3 is not cut due to errors such as straightness. In addition, since the clearance space 4 is formed by the notch 311 of the first flange 31, the first flange 31 and the second flange 32 can fit tightly except for the position of the notch 311 when connected by the bolts 33, so that the structure of the longitudinal flange group 3 is more stable, and the bolts 33 connected between the first flange 31 and the second flange 32 are ensured to be evenly stressed, and the installation is convenient.

[0060] In this embodiment, the first flange 31 and the second flange 32 are asymmetric structures. During manufacturing, it is only necessary to set the notch 311 on one flange (the first flange 31), and there is no need to set the notch 311 on both flanges (the first flange 31 and the second flange 32), thereby simplifying the processing operation and reducing the processing cost.

[0061] In addition, the longitudinal flange group 3 is in a connected state before being welded and fixed to the inner wall of the barrel 1. During the cutting process, since the longitudinal flange group 3 is in a connected state, after the cutting is completed, due to the connection of the longitudinal flange group 3, the two adjacent tower segments are still in a connected state, and the overall structure is stable. In this way, the tower segment can be prevented from being greatly deformed during the cutting process, thereby ensuring the roundness of the tower segment, and facilitating the subsequent on-site installation operation. In addition, after the first flange 31 and the second flange 32 are fixed by bolts 33, they are fixed to the inner wall of the barrel 1 as a whole, and the longitudinal flange group 3 is disassembled after the cutting of the tower segment is completed. In this way, the longitudinal flange group 3 only needs to be assembled and disassembled once, reducing repetitive operations and being more efficient.

[0062] In the above embodiment, the thickness of the first flange 31 is greater than that of the second flange 32. The first flange 31 is provided with a notch 311, and the notch 311 is arranged toward the second flange 32 and the inner wall of the cylinder 1. At this time, the thickness of the first flange 31 is set larger, so that it has better rigidity, reduces the deformation after processing, and has better straightness when it is matched with the second flange 32, ensuring that the two can fit closely.

[0063] Furthermore, in this embodiment, the notch 311 is provided on one side edge of the first flange 31 facing the second flange 32 and the inner wall of the cylinder sheet 11. The notch 311 can form the above-mentioned clearance space 4 between the first flange 31, the second flange 32 and the inner wall of the cylinder sheet 11. Alternatively, in this embodiment, the notch 311 can also be provided on the side of the first flange 31 facing the inner wall of the cylinder sheet 11, in which case the clearance space 4 is formed between the first flange 31 and the inner wall of the cylinder sheet 11. The clearance space 4 is provided between the first flange 31, the second flange 32 and the cylinder sheet 11, which can reduce the thickness and strength requirements of the first flange 31 and simplify the processing technology.

[0064] Specifically, in this embodiment, there is no limitation on the specific shape of the notch 311. Figure 2 As shown, the notch 311 can be set as a chamfered corner at the above-mentioned side edge, or as shown in Figure 3 and 4 The notch 311 may be configured as a groove disposed at the above-mentioned side edge.

[0065] In the above embodiment, the depth and width of the clearance space 4 are not less than 5 mm, wherein the depth of the clearance space 4 refers to the dimension along the fitting surface direction between the first flange 31 and the second flange 32, and the width of the clearance space 4 refers to the dimension along the circumferential direction of the cylinder 1. The depth and width are not less than 5 mm, which can ensure that the size of the accommodation space is sufficient to avoid interference with the cutting of the tower section by the longitudinal flange group 3 and can be sufficient to accommodate cutting debris.

[0066] Of course, the size of the clearance space 4 is determined by its depth and width. The specific width of the clearance space 4 is aligned with the marking line. When cutting, the cut 5 is ensured to be within the width range of the clearance space 4. If the width is set too large, it will affect the structural strength of the first flange 31. Therefore, in order to ensure a clearance space 4 of sufficient size, in this embodiment, the depth of the clearance space 4 is not less than the width of the clearance space 4, so that the clearance space 4 is large enough while ensuring the structural strength of the first flange 31. Specifically, the specific size of the clearance space 4 is not limited here and can be set according to actual conditions.

[0067] In the above embodiment, the first flange 31 and the inner wall of the cylinder 1, as well as the second flange 32 and the inner wall of the cylinder 1, are fixed by full penetration welding or double-sided welding. Figure 2 and Figure 3 As shown, when the longitudinal flange group 3 is integrally welded to the inner wall of the cylinder 1, full penetration welding is performed between the outer side of the longitudinal flange group 3 and the inner wall of the cylinder 1 to fix the first flange 31 or the second flange 32. The double-sided weld is as shown in FIG. Figure 4 As shown, when the longitudinal flange group 3 is integrally welded to the inner wall of the cylinder 1, the outer side of the longitudinal flange group 3 is welded to the inner wall of the cylinder 1 to form an outer weld 62. After the cutting is completed and the longitudinal flange group 3 is disassembled, the inner side of the first flange 31 and the second flange 32 can be welded to the inner wall of the cylinder 1 to form an inner weld 63. The outer side of the longitudinal flange group 3 refers to the side away from the clearance space 4, and the inner side of the longitudinal flange group 3 refers to the side facing the clearance space 4. Fixing the first flange 31 and the second flange 32 to the inner wall of the cylinder 1 by double-sided welding can ensure that the connection between the first flange 31 and the second flange 32 and the cylinder 1 is more stable, thereby ensuring the structural stability of the tower section formed by assembling each cylinder segment 11.

[0068] In step S1 of the manufacturing method of the tower section, the end flange 2 is an annular integral flange before being connected to the end of the cylinder 1, that is, when the tower section is cut, the cylinder 1 and the end flange 2 located at the end of the cylinder 1 are cut at the same time. Alternatively, in this embodiment, the end flange 2 can also be directly formed by splicing the slice structure. Before the end flange 2 is welded and fixed to the end of the cylinder 1, the slice structure is first spliced ​​to form the end flange 2 of the annular structure. The solution of directly using the annular integral flange does not require the assembly of the slice structure, reduces the operation process, and can also eliminate the deviation introduced in the assembly process, etc., to ensure the accuracy of the end flange 2, which is convenient for the later assembly of each tower section.

[0069] In the above embodiment, step S11 is further included between step S1 and step S2: an inner reference line is drawn on the inner wall of the cylinder 1 based on the identification line, and then in step S2, the longitudinal flange group 3 in the connected state is welded and fixed to the inner wall of the cylinder 1 based on the inner reference line, so that the inner reference line is located in the clearance space 4. That is to say, before the longitudinal flange group 3 is fixed to the inner wall of the cylinder 1, an inner reference line is drawn on the inner wall of the cylinder 1 based on the identification lines of the end flanges 2 at both ends of the cylinder 1, and then the fixing position of the longitudinal flange group 3 is determined based on the inner reference line. In this way, it is convenient to observe whether the position of the longitudinal flange group 3 is correct when fixing it.

[0070] Since both the cutting reference line and the inner reference line are drawn based on the identification line of the end flange 2, the cutting reference line and the inner reference line are coplanar and the planes where the two are located can be perpendicular to the side wall of the cylinder 1 and pass through the axis of the cylinder 1. Therefore, when cutting along the cutting reference line later, it is easy to find out whether the cutting position deviates from the reference in time so as to make corrections in time.

[0071] Specifically, in this embodiment, according to the inner reference line, the longitudinal flange group 3 is first fixed to the inner wall of the cylinder 1 by spot welding or positioning tooling, and then welding is performed along the connection between the outer side of the longitudinal flange group 3 and the inner wall of the cylinder 1.

[0072] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A tower section, characterized in that: It comprises a cylinder (1) and two end flanges (2) respectively arranged at two ends of the cylinder (1); The cylinder (1) comprises at least two cylinder pieces (11) arranged along the circumferential direction, and two adjacent cylinder pieces (11) are connected via a longitudinal flange group (3) arranged along the axial direction of the cylinder (1); The longitudinal flange group (3) comprises a first flange (31) and a second flange (32) respectively welded to the side walls of the two cylinder pieces (11); of the first flange (31) and the second flange (32), only the first flange (31) is provided with a notch (311); the notch (311) is capable of forming a clearance space (4) arranged in the axial direction between the longitudinal flange group (3) and the inner wall of the cylinder piece (11); The clearance space (4) is located on one side of the joint surface of the first flange (31) and the second flange (32), and the clearance space (4) is used to cut the tower section from the outside of the cylinder (1).

2. The tower section according to claim 1, characterized in that: The thickness of the first flange (31) is greater than the thickness of the second flange (32).

3. The tower section according to claim 2, characterized in that: The notch (311) is provided on a side edge of the first flange (31) facing the second flange (32) and the inner wall of the cylinder sheet (11).

4. The tower section according to any one of claims 1 to 3, characterized in that: The first flange (31) and the second flange (32) are fixedly connected by bolts (33).

5. The tower section according to any one of claims 1 to 3, characterized in that: The depth and width of the clearance space (4) are not less than 5 mm.

6. The tower section according to claim 5, characterized in that: The depth of the clearance space (4) is not less than the width of the clearance space (4).

7. The tower section according to any one of claims 1 to 3, characterized in that: The first flange (31) and the inner wall of the cylinder (1) are fixed by full penetration welding or double-sided welding, and the second flange (32) and the inner wall of the cylinder (1) are fixed by full penetration welding or double-sided welding.

8. A tower, characterized in that: It comprises a plurality of tower sections according to any one of claims 1 to 7, wherein the tower sections are connected via end flanges (2).

9. A method for manufacturing a tower segment based on the tower segment according to any one of claims 1 to 7, characterized in that: The steps include: S1: fix two end flanges respectively at two ends of the cylinder to obtain a tower section, and align the identification lines of the two end flanges in the longitudinal direction; S2: Welding and fixing the connected longitudinal flange assembly to the inner wall of the cylinder so that the identification line is located in the clearance space of the longitudinal flange assembly; S3: Drawing a cutting reference line on the outer wall of the cylinder based on the identification lines of the two end flanges; S4: Cutting the tower sections from the outside based on the cutting reference lines respectively; S5: removing the connection of the longitudinal flange set to form at least two separated cylinder segments.

10. The method for manufacturing a tower section according to claim 9, characterized in that: In step S1, the end flange is an annular integral flange.

11. The method for manufacturing a tower segment according to claim 9, characterized in that: The step S11 is further included between step S1 and step S2: drawing an inner reference line on the inner wall of the cylinder based on the identification line; In step S2, the longitudinal flange assembly in a connected state is welded and fixed to the inner wall of the cylinder body with the inner reference line as a reference, so that the inner reference line is located in the clearance space.

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