Wind power tower drum internal welding preheating tooling

Abstract

The utility model relates to a wind power tower drum inside welding preheating tool, and this tool relates to wind power tower drum production technical field, including flame nozzle frame, hollow connecting frame, gas pipe connecting mouth, bottom support, normal wheel, the hollow connecting frame is movably sleeved on the bottom support, one end of the hollow connecting frame is equipped with the gas pipe connecting mouth for air inlet, the other end of the hollow connecting frame is in communication with the flame nozzle frame, more than one nozzle is equipped on the flame nozzle frame, the nozzle of the flame nozzle frame is towards the inner wall bevel position of wind power tower drum and sprays flame and preheats, the bottom support is equipped with normal wheel on the frame body bottom, the tool is located in the wind power tower drum, even if the wind power tower drum rotates, the tool can automatically normal, ensure that the preheating area is the opposite area of the outside preheating tool, when cooperating with the outside preheating tool, preheats the upper and lower ends, keeps the whole preheating temperature of wind power tower drum reaches the temperature required by welding, ensures the welding quality.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power tower production, and particularly relates to a preheating tool for internal welding of wind power towers. Background Technique

[0002] Wind power towers are generally welded by large steel plates. These steels have a certain carbon equivalent and alloy content. During the welding process, if proper preheating and slow cooling treatments are not carried out, defects such as cold cracks and embrittlement in the heat-affected zone are likely to occur. By preheating, the cooling rate of the weld and the heat-affected zone can be reduced, allowing hydrogen enough time to escape and reducing the risk of hydrogen-induced cracks. Slow cooling helps to relieve the residual stress after welding and avoid weld cracking due to stress concentration. With the continuous progress of welding technology and the increasing perfection of relevant standards and specifications, the wind power industry has also paid more attention to welding quality control. Wind power standards in many countries and regions clearly stipulate that weld preheating and slow cooling treatments must be carried out under specific circumstances to ensure that the welding quality meets the requirements. At the same time, the emergence of advanced heating equipment and temperature control technologies has also provided strong support for the application of preheating and slow cooling technologies.

[0003] Current situation of preheating and slow cooling for tower barrel circumferential joints: Before welding, use a preheating tool on the outer wall of the tower barrel to preheat the two sides of the groove within a range of 100 mm to 80 - 120 °C. Keep the preheating temperature before welding and carry out welding. After welding is completed, immediately use a slow cooling tool to locally bake the weld and the surrounding area within the temperature range of 150 - 350 °C for 1 h to avoid rapid temperature reduction of the weld and generate hardened structures.

[0004] During the entire preheating stage, the heating tool only heats the outer wall on the outside of the tower barrel, and the heating range of the outer wall heating tool is also related to the rotation speed of the tower barrel. The cooling temperature of the steel plate at room temperature is about 10 °C / min, the circumference of the tower barrel steel plate is about 15 m, and the maximum rotation speed of the roller rack is 1200 mm / min. After the tower barrel rotates to the area covered by the external heating tool on the opposite side, the preheating temperature may not reach 80 - 120 °C. To ensure that the required preheating temperature can be achieved throughout the preheating stage, this tool is designed and manufactured. Content of the Utility Model

[0005] In view of the deficiencies of the existing technology, the utility model provides a preheating tool for internal welding of wind power towers. This tool can be used in cooperation with an external heating tool to ensure the preheating temperature on both sides of the tower barrel groove before welding, meet its welding temperature requirements, and ensure welding quality.

[0006] To achieve the above objectives, the utility model is realized through the following technical solutions: A preheating fixture for welding inside a wind turbine tower includes a flame nozzle frame, a hollow connecting frame, a gas pipe connector, a bottom support, and a centering wheel. The hollow connecting frame is movably mounted on the bottom support. One end of the hollow connecting frame is provided with a gas pipe connector for air intake. The other end of the hollow connecting frame is connected to the flame nozzle frame. The flame nozzle frame has one or more nozzles. The nozzles of the flame nozzle frame spray flames towards the beveled position of the inner wall of the wind turbine tower for preheating. A centering wheel is installed at the bottom of the bottom support frame.

[0007] Preferably, the flame nozzle holder is an arc-shaped pipe; the gas pipe connector is connected to the gas source through the gas pipe; the gas ejected from the flame nozzle holder is ignited by the ignition burner.

[0008] Preferably, the hollow connecting frame is a hollow square tube; the hollow connecting frame has two air intake routes, and the two air intake routes are connected to the flame nozzle frame.

[0009] Preferably, a sleeve is fixed to the top of the bottom bracket; the hollow connecting frame is movably inserted into the sleeve; a threaded hole is provided on one side of the sleeve, and a bolt is provided in the threaded hole; the hollow connecting frame is tightened and fixed by bolts.

[0010] Preferably, the centering wheel is divided into a front wheel and a rear wheel; the front wheel moves along the circumferential bevel of the wind turbine tower; the wheel direction of the centering wheel is perpendicular to the axis of the wind turbine tower; the wind turbine tower is placed horizontally above the roller frame and is driven to rotate by a motor.

[0011] Preferably, the bottom support is provided with a counterweight groove; a counterweight is placed in the counterweight groove; and a handle is welded to the top of the counterweight.

[0012] The beneficial effects of this utility model are: 1. This fixture is located inside the wind turbine tower. Even if the wind turbine tower rotates, the fixture can automatically return to its original position, ensuring that the preheating area is the opposite area of ​​the outer preheating fixture. When used in conjunction with the outer preheating fixture, preheating is performed at both the top and bottom ends to maintain the overall preheating temperature of the wind turbine tower at the temperature required for welding, thus ensuring welding quality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall positional relationship of this utility model.

[0015] Figure 2 This is a schematic diagram showing the internal placement of the wind turbine tower according to this utility model.

[0016] Figure 3 This is a side sectional view of the present invention.

[0017] Figure 4 This is a schematic diagram of the tooling connection relationship of this utility model.

[0018] Figure 5 This is a schematic diagram showing the location of the external preheating fixture of this utility model.

[0019] In the figure, flame nozzle holder 1, nozzle 1.1, hollow connecting frame 2, gas pipe connecting nozzle 3, bottom support 4, sleeve 4.1, bolt 4.2, counterweight groove 4.3, centering wheel 5, front wheel 5.1, rear wheel 5.2, wind turbine tower 6, bevel 6.1, counterweight 7, flange 8, and roller frame 9. Detailed Implementation

[0020] like Figure 1-5 To achieve the above objectives, this utility model employs the following technical solution: A preheating fixture for welding inside a wind turbine tower is disclosed. This fixture primarily preheats the area opposite to the external preheating fixture from inside the wind turbine tower 6. The fixture is supported by a bottom support 4, on which a hollow connecting frame 2 is movably mounted. Specifically, a sleeve 4.1 is fixed to the top of the bottom support 4; the hollow connecting frame 2 is movably inserted into the sleeve 4.1; a threaded hole is provided on one side of the sleeve 4.1, and a bolt 4.2 is installed in the threaded hole; the hollow connecting frame is tightened and fixed by the bolt 4.2. Loosening the bolt 4.2 allows the hollow connecting frame 2 to be adjusted vertically to control the distance between the flame nozzle holder 1 and the inner wall of the wind turbine tower 6.

[0021] like Figure 2 , 4 As shown, the hollow connecting frame 2 is a hollow square tube; one end of the hollow connecting frame 2 is equipped with a gas pipe connection nozzle 3 for air intake; the other end of the hollow connecting frame 2 is connected to the flame nozzle frame 1; furthermore, the hollow connecting frame 2 has two air intake routes, which are connected to the flame nozzle frame 1. The nozzle frame is an arc-shaped pipe; the gas pipe connection nozzle 3 is connected to the gas source through a gas pipe; the gas ejected from the flame nozzle frame 1 is ignited by an ignition burner. The flame nozzle frame 1 has one or more nozzles; the nozzles used in our factory are Φ25×t2 round pipes. The nozzles of the flame nozzle frame 1 spray flames towards the bevel 6.1 on the inner wall of the wind turbine tower 6 for preheating; like Figure 2-5As shown, a centering wheel 5 is installed at the bottom of the bottom support 4. The centering wheel 5 consists of a front wheel 5.1 and a rear wheel 5.2; the front wheel 5.1 moves along the circumferential bevel 6.1 of the wind turbine tower 6; since this position requires preheating, the centering wheel is made of cast iron to ensure normal operation. The wheel direction of the centering wheel 5 is perpendicular to the axis of the wind turbine tower 6; the wind turbine tower 6 is placed horizontally above the roller frame 9 and is driven to rotate by a motor. To further ensure the centering effect, a counterweight groove 4.3 is provided on the bottom support 4; a counterweight 7 is placed in the counterweight groove 4.3. The counterweight 7 is located in the middle of the bottom support 4. When the wind turbine tower 6 rotates through the roller frame 9, the fixture is centered to a vertical position due to the influence of the counterweight 7. The counterweight 7 is made of solid steel with dimensions of 100mm×1500mm×200mm, and a handle is welded to the top.

[0022] Workflow: The tooling is placed inside one end of the wind turbine tower 6 for welding the flange 8 to the wind turbine tower 6. The height of the hollow connecting frame 2 is adjusted by bolts 4.2 to a suitable height; the gas source control valve is opened, and the ignition gas enters the hollow connecting frame 2 and is finally transmitted to the nozzle position of the nozzle frame. The operator uses the ignition burner to ignite the gas.

[0023] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A preheating fixture for welding inside a wind turbine tower, characterized in that: It includes a flame nozzle holder, a hollow connecting frame, an air pipe connector, a bottom support, and a centering wheel; the hollow connecting frame is movably mounted on the bottom support; one end of the hollow connecting frame is provided with an air pipe connector for air intake; the other end of the hollow connecting frame is connected to the flame nozzle holder; the flame nozzle holder has one or more nozzles; the nozzles of the flame nozzle holder spray flames towards the beveled position of the inner wall of the wind turbine tower for preheating; and a centering wheel is installed at the bottom of the bottom support frame.

2. The preheating fixture for welding inside a wind turbine tower according to claim 1, characterized in that: The flame nozzle holder is an arc-shaped pipe; the gas pipe connector is connected to the gas source through the gas pipe; the gas ejected from the flame nozzle holder is ignited by the ignition burner.

3. The preheating fixture for welding inside a wind turbine tower according to claim 1, characterized in that: The hollow connecting frame is a hollow square tube; the hollow connecting frame has two air intake routes, which are connected to the flame nozzle frame.

4. The preheating fixture for internal welding of a wind turbine tower according to claim 1, characterized in that: A sleeve is fixed to the top of the bottom support; the hollow connecting frame is movably inserted into the sleeve; a threaded hole is provided on one side of the sleeve, and a bolt is provided in the threaded hole; the hollow connecting frame is tightened and fixed by bolts.

5. The preheating fixture for welding inside a wind turbine tower according to claim 1, characterized in that: The straightening wheel is divided into a front wheel and a rear wheel; the front wheel moves along the circumferential bevel of the wind turbine tower; the wheel direction of the straightening wheel is perpendicular to the axis of the wind turbine tower; the wind turbine tower is placed horizontally above the roller frame and is driven to rotate by a motor.

6. The preheating fixture for welding inside a wind turbine tower according to claim 4, characterized in that: The bottom support is provided with a counterweight groove; a counterweight is placed in the counterweight groove; and a handle is welded to the top of the counterweight.

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