Rapid centering method for upper tower drum and lower tower drum in hoisting of large fan

Abstract

The invention discloses a method for quickly centering an upper tower drum and a lower tower drum during hoisting of a large fan, which belongs to the technical field of fan mounting and comprises the following steps: S1, mounting a stiffening ring on the top of the mounted lower tower drum, and mounting a plurality of arc-shaped high-elastic steel bars on the stiffening ring at equal intervals in the circumferential direction; s2, elastic buttons are installed, specifically, the elastic buttons are installed in a plurality of top flange holes formed in the circumferential direction of the top face of the lower section tower drum; s3, the upper section of tower drum is hoisted, and the bottom of the upper section of tower drum is located among the multiple arc-shaped high-elasticity steel bars; s4, the upper section of tower drum is centered, and flange holes in the bottom of the upper section of tower drum are aligned with the multiple elastic buttons on the lower section of tower drum; and S5, the upper section of tower drum and the lower section of tower drum are fixed. According to the rapid centering method for the upper and lower sections of tower drums in large fan hoisting, the structure is simple, use is convenient, rapid centering of the upper and lower sections of tower drums is facilitated, and therefore the installation efficiency of a fan is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbine installation, and in particular relates to a method for quickly centering upper and lower tower sections during the hoisting of a large wind turbine. Background Art

[0002] With the huge demand for new energy in my country, the installation and size of large wind turbines have gradually experienced a breakthrough growth. The single-unit capacity of offshore and onshore wind turbines has exceeded 20 MW and 10 MW respectively. The installation height of large wind turbines is usually above 100 meters. As the height increases, the wind speed gradually increases, and the wind energy also increases, thereby improving the power generation efficiency. At present, the highest height can reach 185 meters. Therefore, the overall tower of large wind turbines is hoisted by segmented towers. Each tower section is about 15 to 25 meters long and about 3 to 7 meters in diameter. During the hoisting process of each tower section, due to the large height and diameter of the tower, it is very difficult to align the bolt connection holes on the upper and lower tower sections during the vertical hoisting of the tower. Summary of the invention

[0003] The purpose of the present invention is to provide a method for quickly centering the upper and lower tower sections during the hoisting of a large wind turbine, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a method for quickly centering the upper and lower tower sections during the installation of a large wind turbine, comprising the following steps:

[0005] S1. Install a stiffening ring on the top of the installed lower tower section, and install multiple arc-shaped high-elastic steel bars at equal intervals around the stiffening ring;

[0006] S2. Install elastic buttons in a plurality of top flange holes arranged circumferentially on the top surface of the lower tower section;

[0007] S3, hoisting the upper tower section, and making the bottom of the upper tower section be located between a plurality of arc-shaped high-elastic steel bars;

[0008] S4, aligning the upper tower section, and aligning the bottom flange hole of the upper tower section with the multiple elastic buttons on the lower tower section;

[0009] S5. Fix the upper tower section and the lower tower section.

[0010] Preferably, two sets of nuts are symmetrically installed at the opening of the stiffening ring in step S1, and a screw is threadedly connected between the two nuts located at the same horizontal position.

[0011] Preferably, a plurality of the arc-shaped highly elastic steel bars are fixedly connected to the outer side of the stiffening ring at equal intervals, and the tops of the arc-shaped highly elastic steel bars are bent toward the outer side of the stiffening ring.

[0012] Preferably, the surfaces of the arc-shaped highly elastic steel strip and the elastic button are respectively coated with lubricant.

[0013] Preferably, in step S4, the upper tower section stops falling when it falls to 0.5 to 1 cm above the lower tower section.

[0014] Preferably, in step S2, the elastic button and the top flange hole are connected by high-strength glue.

[0015] Preferably, a high-elastic steel sheet is fixedly connected to one side of the elastic button.

[0016] The present invention discloses the following technical effects: the method for quickly centering the upper and lower tower sections during the installation of a large wind turbine of the present invention has a simple structure and is easy to use, and is convenient for quickly centering the upper and lower tower sections, thereby improving the installation efficiency of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a schematic diagram of the process of hoisting and centering the upper tower section and the lower tower section of the present invention;

[0019] Figure 2 This is a rendering of the elastic button of the present invention bonded to the top flange hole of the lower tower section;

[0020] Figure 3 This is a schematic diagram of the structure of the high-elastic steel sheet and the elastic button of the present invention;

[0021] Figure 4 It is a schematic structural diagram of a stiffening ring with an arc-shaped high-elastic steel strip according to the present invention.

[0022] In the figure: 1. Stiffening ring; 2. Arc-shaped high-elastic steel bar; 3. Screw; 4. Lower tower section; 5. Top flange hole; 6. Elastic button; 7. High-elastic steel sheet; 8. Upper tower section; 9. Bottom flange hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 1-Figure 4 As shown, this embodiment provides a method for quickly centering the upper and lower tower sections 4 during the installation of a large wind turbine, comprising the following steps:

[0026] S1, install a stiffening ring 1 on the top of the installed lower tower section 4, and install a plurality of arc-shaped high-elastic steel bars 2 at equal intervals on the stiffening ring 1;

[0027] S2, installing the elastic button 6, installing the elastic button 6 in a plurality of top flange holes 5 arranged circumferentially on the top surface of the lower tower section 4;

[0028] S3, hoisting the upper tower section 8, and making the bottom of the upper tower section 8 be located between the plurality of arc-shaped high-elastic steel bars 2;

[0029] S4, aligning the upper tower section 8, and aligning the bottom flange hole 9 of the upper tower section 8 with the multiple elastic buttons 6 on the lower tower section 4;

[0030] S5, fixing the upper tower section 8 and the lower tower section 4.

[0031] The method for quickly centering the upper and lower tower sections 4 during the hoisting of a large wind turbine of the present invention has a simple structure and is easy to use, and is convenient for quickly centering the upper and lower tower sections 4, thereby improving the installation efficiency of the wind turbine.

[0032] According to a further optimization scheme, two groups of nuts are symmetrically installed at the opening of the stiffening ring 1 in step S1, and the two nuts of the same group are respectively located on both sides of the opening of the stiffening ring 1, and a screw rod 3 is threadedly connected between the two nuts located at the same horizontal position.

[0033] The stiffening ring 1 is made of a steel sheet with a width of 20 cm and a thickness of 8 mm, bent into a circular stroke slightly larger than the diameter of the wind turbine tower; two upper and lower clamping screws 3 and nuts are welded at the opening of the stiffening ring 1, and the stiffening ring 1 can be tightened or loosened by tightening or loosening the upper and lower screws 3.

[0034] According to a further optimized solution, a plurality of arc-shaped highly elastic steel bars 2 are fixedly connected to the outer side of the stiffening ring 1 at equal intervals, and the tops of the arc-shaped highly elastic steel bars 2 are bent toward the outer side of the stiffening ring 1 .

[0035] Five smooth arc-shaped high-elastic φ30mm steel bars, namely arc-shaped high-elastic steel bars 2, are evenly welded around the stiffening ring 1. The upper ends of the five arc-shaped high-elastic steel bars 2 expand to the surrounding areas to form an upwardly open trumpet shape, which makes it easy for the upper tower section 8 to slide along the opened trumpet-shaped arc-shaped steel bars to the top of the lower tower section 4, thereby promoting centering.

[0036] According to a further optimized solution, the surfaces of the arc-shaped highly elastic steel strip 2 and the elastic button 6 are coated with lubricants respectively.

[0037] To further optimize the solution, in step S4, the upper tower section 8 stops falling when it falls to 0.5 to 1 cm above the lower tower section 4.

[0038] Further optimizing the solution, in step S2, the elastic button 6 is connected to the top flange hole 5 by high-strength glue. The connection between each section of the wind turbine tower is connected by flanges and bolts (M36) at the connection of each section of the tower.

[0039] In a further optimized solution, a high elastic steel sheet 7 is fixed to one side of the elastic button 6. There are 8 elastic buttons 6 in total; before hoisting the upper tower section 8, the 8 elastic buttons 6 are installed in the top flange holes 5 of the lower tower section 4 to form a raised elastic button 6.

[0040] The specific steps for aligning the upper and lower towers include:

[0041] S1. Before hoisting the upper tower section on the foundation or on the installed lower tower section, install the stiffening ring 1 on the top of the lower tower section 4 through the upper and lower point screws 3 and nuts of the stiffening ring 1, so that the upper edge of the stiffening ring 1 is flush with the top of the lower tower section 4; apply a layer of lubricant on the surface of the 5 smooth arc-shaped high-elastic steel bars 2 installed on the stiffening ring 1 at the upper end of the lower tower section 4 to ensure that the upper tower section 8 can slide smoothly to the top of the lower tower section 4 without scratching the outer surface of the upper tower section 8 during hoisting and centering.

[0042] S2. Use high-strength glue to bond the elastic button 6 with the high-elastic steel sheet 7 to the top flange hole 5 of the lower tower section 4, so that the elastic button 6 protrudes from the top of the flange hole, and evenly distribute the 8 elastic buttons 6 on the top flange hole 5 of the lower tower section 4. Apply lubricant to the surface of the 8 elastic buttons 6 protruding from the top flange hole 5, so that the flange hole can be more smoothly aligned when the upper tower section 8 rotates.

[0043] S3. Use a crane to lift the upper tower section 8 to the top of the lower tower section 4, and keep the upper tower section 8 within the range controlled by the trumpet formed by the five smooth arc-shaped high-elastic steel bars 2 on the stiffening ring 1; the crane drives the upper tower section 8 to slowly descend, and adjusts the horizontal position of the upper tower section 8 according to the collision or friction between the upper tower section 8 and the arc-shaped high-elastic steel bars 2 on the stiffening ring 1, to ensure that the upper tower section 8 can be smoothly aligned with the upper surface of the lower tower section 4 as it descends.

[0044] S4. When the upper tower section 8 slowly slides along the 5 arc-shaped steel bars on the stiffening ring 1 to 0.5-1 cm above the top of the lower tower section 4, it stops falling; then, the upper tower section 8 is driven by a crane to rotate in situ. When the bottom flange hole 9 of the upper tower section 8 is directly opposite to the top flange hole 5 of the lower tower section 4, the elastic button 6 installed on the top flange hole 5 of the lower tower section 4 will bounce upward and enter the bottom flange hole 9 of the upper tower section 8, so that the upper tower section 8 cannot rotate. At this time, the upper tower section 8 and the lower tower section 4 have been completely aligned.

[0045] S5. Use the bolts and nuts prepared in advance to connect the flanges of the upper and lower tower sections 4 to fix the flange holes where the elastic buttons 6 are not arranged; then, use a solvent of high-strength metal glue to remove the high-elastic steel sheet 7 and the elastic button 6 on the top flange of the lower tower section 4; and then use the tightening bolts and nuts to remove the stiffening ring 1 fixed on the top of the lower tower section 4.

[0046] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for quickly centering the upper and lower tower sections during the installation of a large wind turbine, characterized in that: The following steps are involved: S1. Install a stiffening ring (1) on the top of the installed lower tower section (4), and install a plurality of arc-shaped high-elastic steel bars (2) at equal intervals around the stiffening ring (1); S2, installing the elastic button (6), installing the elastic button (6) in a plurality of top flange holes (5) arranged circumferentially on the top surface of the lower tower tube (4); S3, hoisting the upper tower section (8), and making the bottom of the upper tower section (8) be located between the plurality of arc-shaped high-elastic steel bars (2); S4, centering the upper tower section (8), and aligning the bottom flange hole (9) of the upper tower section (8) with the plurality of elastic buttons (6) on the lower tower section (4); S5, fixing the upper tower section (8) and the lower tower section (4).

2. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: Two sets of nuts are symmetrically installed at the opening of the stiffening ring (1) in step S1, and a screw rod (3) is threadedly connected between the two nuts located at the same horizontal position.

3. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: A plurality of arc-shaped highly elastic steel bars (2) are fixedly connected at equal intervals to the outside of the stiffening ring (1), and the tops of the arc-shaped highly elastic steel bars (2) are bent toward the outside of the stiffening ring (1).

4. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: The surfaces of the arc-shaped high-elastic steel strip (2) and the elastic button (6) are respectively coated with lubricant.

5. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: In step S4, the upper tower section (8) stops falling when it falls to 0.5 to 1 cm above the lower tower section (4).

6. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: In step S2, the elastic button (6) and the top flange hole (5) are connected by high-strength glue.

7. The method for quickly centering the upper and lower tower sections during the installation of a large wind turbine according to claim 1 is characterized in that: A high-elastic steel sheet (7) is fixedly connected to one side of the elastic button (6).

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