Post-welding slow cooling and heat preservation tool for wind power tower drum

Abstract

The utility model discloses a post-welding slow cooling and heat preservation tool for a wind power tower drum, which relates to the technical field of post-welding slow cooling and comprises a flange and a plurality of drum sections, and the flange and the drum sections are sequentially welded through circular seams to form the wind power tower drum. First asbestos is attached to the peripheral surface of a first circular seam on the inner side between the flange and the shell ring, and the first asbestos forms a ring shape through a plurality of first pressing plate assemblies and connecting pieces and is inserted and fixed through first bolts. Second asbestos is attached to the peripheral surface of a second circular seam on the inner side between the two shell rings, and the second asbestos forms a ring shape through a plurality of second pressing plate assemblies, a supporting frame and a top plate in an enclosing mode and is fixed through second bolts in an inserted connection mode. The heat preservation device has the advantages that the first asbestos, the first pressing plate assembly, the connecting piece, the second asbestos, the second pressing plate assembly, the supporting frame and the top plate are installed, local heat preservation of the inner side circular seam of the wind power tower drum is achieved, the temperature of the welding seam can be prevented from being rapidly reduced, and welding quality is improved.

Description

Technical field:

[0001] The utility model relates to the technical field of post-weld slow cooling, in particular to a post-weld slow cooling and heat preservation tooling for a wind power tower. Background technology:

[0002] The manufacturing process of a wind turbine tower involves rolling the cut steel plates using an upper roller roll. The rolled steel plates then undergo the first welding process, i.e., longitudinal seam welding, to form the tube segments. Before the final welding, the tube segments must be aligned with the flanges and with each other. After the tube segments are aligned, the next step is circumferential seam welding. This is performed using submerged arc automatic welding, using double-sided welding. First, the inner wall groove is welded, then the outer wall is cleaned to expose the weld groove metal, and finally, the outer wall is welded. Therefore, the production of wind turbine towers requires a large number of welding processes. Preheating before welding and slow cooling after welding are important indicators for improving welding requirements.

[0003] The purpose of slow cooling after welding is to prevent the formation of brittle and hard structures, reduce the tendency of cracks, promote the escape of diffused hydrogen, reduce the tendency of hydrogen-induced cracks, and reduce the residual stress of the weld joint.

[0004] During the existing longitudinal seam welding and circumferential seam welding process: oil and impurities within 20mm on both sides of the weld must be removed, and the range of 100mm on both sides of the groove must be preheated to 80-120℃. The surface on both sides of the weld 25mm away from the center of the weld is used as the temperature measuring point. Maintain the preheating temperature before welding and perform welding.

[0005] The current problem is that after the longitudinal seam welding is completed, the weld and surrounding areas are immediately covered with asbestos for local insulation during slow cooling. The weld is baked to a temperature range of 150-350°C and kept warm for 1 hour to avoid a rapid drop in weld temperature and the formation of hardened structure for slow cooling.

[0006] After the girth welding is completed, the inner girth cannot be directly covered with asbestos because it is in the tower section stage. Therefore, the inner girth can only be baked and heated for slow cooling during slow cooling to avoid the weld temperature from dropping rapidly and producing hardened structure. However, there is still a problem of rapid temperature drop during the girth welding process, which leads to defects in the weld and affects the welding quality. This problem needs to be solved. Utility model content:

[0007] The purpose of the utility model is to provide a post-weld slow cooling and heat preservation tooling for a wind power tower, so as to solve the problems raised in the above-mentioned background technology.

[0008] The utility model is implemented by the following technical solutions:

[0009] A post-weld slow cooling and heat preservation tool for a wind power tower, comprising a flange and a plurality of cylinder segments, wherein the flange and the plurality of cylinder segments are sequentially welded via circumferential seams to form a wind power tower;

[0010] A first asbestos is attached to the peripheral surface of the first annular gap on the inner side between the flange and the cylinder section. The first asbestos is clamped between the first pressure plate assembly and the first annular gap. The first pressure plate assembly is provided with a plurality of components and forms a ring. A plurality of connecting pieces are evenly fixed on the inner lower surface of the flange and form a ring. The connecting pieces are horizontally threaded with first bolts. The first pressure plate assembly is fixed by the first bolts.

[0011] A second asbestos is attached to the peripheral surface of the second annular gap on the inner side between the two cylinder sections. The second asbestos is clamped between the second pressure plate assembly and the second annular gap. The second pressure plate assembly is provided in plurality and forms a ring. A plurality of support frames are fixed between two adjacent cylinder sections. Top plates are threadedly connected to both sides of the support frames by second bolts. The plurality of top plates form a ring, so that the second pressure plate assembly is fixed by plugging in the second bolts.

[0012] Preferably, the first pressure plate assembly and the second pressure plate assembly have the same structure, both including an arc-shaped pressure plate and an arc-shaped steel pipe; a plurality of grooves are provided on the surface of the arc-shaped steel pipe away from the arc-shaped pressure plate, so that the screw parts of the first bolt and the second bolt pass through the grooves and are inserted into the arc-shaped steel pipe.

[0013] Preferably, the connecting member structure is in an "L" shape, one horizontal end of the connecting member is fixed to the lower inner surface of the flange, and the other vertical end of the connecting member is threadedly connected to two first bolts.

[0014] Preferably, the support frame structure is in the shape of a "cross", and the support frame includes: a horizontally arranged arc-shaped connecting plate and a vertically arranged angle steel frame; the angle steel frame and the arc-shaped connecting plate are cross-arranged and welded, and rectangular through grooves are horizontally opened on both sides of the arc-shaped connecting plate; the two sides of the arc-shaped connecting plate are threadedly connected to the top plate through a second bolt, and the upper and lower ends of the angle steel frame are fixedly connected to the pre-welded parts on the cylinder section.

[0015] Preferably, nuts are fixed on both sides of the top plate, and the nuts are threadedly connected to the second bolts.

[0016] The advantages of the utility model are as follows: by installing the first asbestos, the first pressure plate assembly and the connecting piece, the annular seam between the flange and the cylinder section can be locally insulated, which can avoid the rapid decrease in weld temperature and improve the welding quality; by installing the second asbestos, the second pressure plate assembly, the support frame and the top plate, the annular seam between the two cylinder sections can be locally insulated, which can avoid the rapid decrease in weld temperature and improve the welding quality. Description of the drawings:

[0017] Figure 1 It is a structural stereogram of the utility model;

[0018] Figure 2 for Figure 1 A top view of

[0019] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0020] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0021] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0022] Figure 6 for Figure 3 Enlarged view of point D in the middle;

[0023] Figure 7 A schematic structural diagram of a first pressing plate assembly and a second pressing plate assembly;

[0024] Figure 8 is a structural diagram of the support frame;

[0025] Figure 9 Schematic diagram of the top plate structure.

[0026] In the figure: 1. Flange, 2. Cylinder section, 2.1. Pre-weld, 12. First annular seam, 3a. First asbestos, 4a. First pressure plate assembly, 5. Connector, 6. First bolt, 22. Second annular seam, 3b. Second asbestos, 4b. Second pressure plate assembly, 7. Support frame, 7.1. Arc-shaped connecting plate, 7.2. Angle steel frame, 8. Second bolt, 9. Top plate, 9.1. Nut, 4.1. Arc-shaped pressure plate, 4.2. Arc-shaped steel pipe, 4.21. Groove. Specific implementation method:

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-9 The utility model provides a technical solution for slow cooling and heat preservation tooling of wind turbine tower after welding:

[0029] A wind power tower post-weld slow cooling and heat preservation tooling comprises a flange 1 and a plurality of cylinder segments 2, wherein the flange 1 and the plurality of cylinder segments 2 are sequentially welded by circumferential seams to form a wind power tower;

[0030] The specific tooling process is divided into two parts.

[0031] Part 1:

[0032] After the circumferential seam welding between the flange 1 and the cylinder section 2 is completed, when preparing for slow cooling, a first asbestos 3a needs to be attached to the peripheral surface of the first circumferential seam 12 on the inner side between the flange 1 and the cylinder section 2, and the first asbestos 3a is clamped between the first pressure plate assembly 4a and the first circumferential seam 12, and the first bolt 6 is horizontally threaded on the connecting piece 5, and the first pressure plate assembly 4a is fixed by the first bolt 6 to prevent the asbestos from falling off; usually there are 8 first pressure plate assemblies 4a and they are arranged in a ring, and 24 connecting pieces 5 are evenly fixed on the inner lower surface of the flange 1 and they are arranged in a ring, so that the first asbestos 3a can locally insulate the first circumferential seam 12 and the surrounding area, and by baking to a temperature range of 150-350℃ and keeping warm for 1h, it is possible to avoid a rapid drop in weld temperature and produce a hardened structure, and slow cooling is performed. After slow cooling, the first asbestos 3a, the first pressure plate assembly 4a and the connecting piece 5 are removed.

[0033] Part II:

[0034] The principle is similar to that of the first part. After the annular seam welding between the two cylinder sections 2 is completed, when preparing for slow cooling, a second asbestos 3b needs to be attached to the peripheral surface of the second annular seam 22 on the inner side of the two cylinder sections 2, and the second asbestos 3b is clamped between the second pressure plate assembly 4b and the second annular seam 22. A plurality of support frames 7 are fixed between the two adjacent cylinder sections 2. The two sides of the support frames 7 are threadedly connected to the top plate 9 by the second bolts 8, so that the second pressure plate assembly 4b is plugged and fixed by the second bolts 8, thereby preventing the asbestos from falling off; the second pressure plate assembly 4b and the top plate 9 are both provided with multiple and annular ones, so that the second asbestos 3b can locally insulate the second annular seam 22 and the surrounding area. By baking to a temperature range of 150-350℃ and keeping warm for 1h, the weld temperature can be prevented from dropping rapidly, resulting in a hardened structure, and slow cooling is performed. After slow cooling, the second asbestos 3b, the second pressure plate assembly 4b, the support frame 7 and the top plate 9 are removed.

[0035] Notes on the above content:

[0036] The first pressure plate assembly 4a and the second pressure plate assembly 4b have the same structure, both comprising a curved pressure plate 4.1 and a curved steel tube 4.2; a plurality of grooves 4.21 are formed on the surface of the curved steel tube 4.2 on the side away from the curved pressure plate 4.1, so that the screw rod portions of the first bolt 6 and the second bolt 8 pass through the grooves 4.21 and are inserted into the curved steel tube 4.2, thereby preventing the curved pressure plate 4.1 from falling off and ensuring that the asbestos is always clamped.

[0037] The connecting member 5 has an L-shaped structure. One horizontal end of the connecting member 5 is fixed to the inner lower surface of the flange 1 , and the other vertical end of the connecting member 5 is threadedly connected to two first bolts 6 .

[0038] The support frame 7 has a "cross" structure and includes: a horizontally arranged arc-shaped connecting plate 7.1 and a vertically arranged angle steel frame 7.2; the angle steel frame 7.2 is cross-arranged and welded with the arc-shaped connecting plate 7.1, and rectangular through slots 7.11 are horizontally opened on both sides of the arc-shaped connecting plate 7.1 to facilitate the insertion of the second bolt 8; the upper and lower ends of the angle steel frame 7.2 are fixedly connected to the pre-welded part 2.1 on the cylinder section 2, and nuts 9.1 are fixed on both sides of the top plate 9. The nuts 9.1 and the second bolt 8 are threadedly connected, so that the two sides of the arc-shaped connecting plate 7.1 are threadedly connected to the top plate 9 through the second bolt 8. The pre-welded part 2.1 is usually fixed to the inner surface of the cylinder section 2, and the installation position of the pre-welded part 2.1 is not fixed. Therefore, the lengths of the angle steel frames 7.2 are different, and the lengths of the arc-shaped connecting plates 7.1 and the top plate 9 are different, but they will eventually form a ring, so that the second asbestos 3b can locally insulate the second annular seam 22 and the surrounding area.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A post-weld slow cooling and heat preservation tool for a wind power tower, comprising a flange (1) and a plurality of cylinder segments (2), wherein the flange (1) and the plurality of cylinder segments (2) are sequentially welded together through circumferential seams to form a wind power tower; Its characteristics are: A first asbestos (3a) is attached to the peripheral surface of the first annular gap (12) inside between the flange (1) and the cylinder section (2), and the first asbestos (3a) is clamped between the first pressure plate assembly (4a) and the first annular gap (12). The first pressure plate assembly (4a) is provided with a plurality of connecting pieces (5) and is arranged in a ring shape. A plurality of connecting pieces (5) are evenly fixed on the inner lower surface of the flange (1) and are arranged in a ring shape. A first bolt (6) is horizontally threaded on the connecting piece (5), and the first pressure plate assembly (4a) is fixed by plugging in the first bolt (6). A second asbestos (3b) is attached to the peripheral surface of the second annular gap (22) inside the two cylinder sections (2), and the second asbestos (3b) is clamped between the second pressure plate assembly (4b) and the second annular gap (22). The second pressure plate assembly (4b) is provided with multiple and is arranged in a ring shape. A plurality of support frames (7) are fixed between two adjacent cylinder sections (2). Both sides of the support frames (7) are threadedly connected to top plates (9) through second bolts (8). The plurality of top plates (9) are arranged in a ring shape, so that the second pressure plate assembly (4b) is fixed by plugging through the second bolts (8).

2. The post-weld slow cooling and heat preservation tooling for a wind turbine tower according to claim 1, characterized in that: The first pressure plate assembly (4a) and the second pressure plate assembly (4b) have the same structure, both comprising an arc-shaped pressure plate (4.1) and an arc-shaped steel pipe (4.2); a plurality of grooves (4.21) are provided on a surface of the arc-shaped steel pipe (4.2) away from the arc-shaped pressure plate (4.1), so that the screw rod portions of the first bolt (6) and the second bolt (8) pass through the grooves (4.21) and are inserted into the arc-shaped steel pipe (4.2).

3. The post-weld slow cooling and heat preservation tooling for a wind turbine tower according to claim 1, characterized in that: The connecting member (5) has an L-shaped structure, one horizontal end of the connecting member (5) is fixed to the inner lower surface of the flange (1), and the other vertical end of the connecting member (5) is threadedly connected to two first bolts (6).

4. The post-weld slow cooling and heat preservation tooling for a wind turbine tower according to claim 1, characterized in that: The support frame (7) has a "cross" structure and comprises: a horizontally arranged arc-shaped connecting plate (7.1) and a vertically arranged angle steel frame (7.2); the angle steel frame (7.2) and the arc-shaped connecting plate (7.1) are cross-arranged and welded, and rectangular through grooves (7.11) are horizontally provided on both sides of the arc-shaped connecting plate (7.1); both sides of the arc-shaped connecting plate (7.1) are threadedly connected to the top plate (9) via second bolts (8), and the upper and lower ends of the angle steel frame (7.2) are fixedly connected to the pre-welded part (2.1) on the cylinder section (2).

5. The post-weld slow cooling and heat preservation tooling for a wind turbine tower according to claim 4, characterized in that: Nuts (9.1) are fixed on both sides of the top plate (9), and the nuts (9.1) are threadedly connected to the second bolts (8).

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