Method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station

Abstract

This invention discloses a method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station. The method comprises the following steps: S1, initial welding is performed between the steel pipe body and the flange; S2, the steel pipe body, having completed the first step, is hoisted into the steel pipe welding station and clamped by a closed-loop rotary clamping seat. A floating support device supports the rear of the steel pipe body, ensuring that the axis of the steel pipe body is perpendicular to the rotation plane of the closed-loop rotary clamping seat; S3, the closed-loop rotary clamping seat is activated, causing the steel pipe body to rotate continuously in one direction, while welding is completed by a welding robotic arm. This method ensures the stability of the rotating plane of the steel pipe during welding, preventing skewness, improving welding quality, extending service life, and enabling continuous 360° rotation welding, further improving welding quality and efficiency, thus increasing the production efficiency of finished steel pipes for steel towers.

Description

Technical Field

[0001] This invention belongs to the field of iron tower manufacturing technology, specifically relating to a method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station. Background Technology

[0002] Transmission towers are mainly divided into two types according to their main structure. One type is constructed using angle steel, while the other type is formed by vertically stacking and connecting tapered steel pipes. This type of tower is also called a steel pipe tower. The steel pipe tower is tapered as a whole, so each individual steel pipe is also tapered in length. In order to improve the overall strength and stability, the cross-section of the steel pipe is also polygonal, that is, the steel pipe is a pyramidal structure. Adjacent steel pipes are connected by flanges. Therefore, before assembly, flanges need to be welded to both ends of the steel pipes. The welding quality of the flanges directly affects the connection quality between adjacent steel pipes.

[0003] The key to flange welding lies in welding the inner and outer seams, as well as the triangular ribs between the flange and the steel pipe. Due to the special structure of the steel pipe, its axis can easily deflect relative to its rotation direction during rotation. This leads to positional misalignment during seam welding, resulting in tensile imbalance in the weld. Under pressure, the flange is prone to skew and deformation, ultimately affecting the service life of the tower. Therefore, in current technology, welding of the inner and outer seams is generally performed by keeping the steel pipe stationary while the operator rotates it. This significantly increases the labor intensity of workers, while also resulting in low welding efficiency, hindering production efficiency and limiting capacity. Summary of the Invention

[0004] In view of this, the present invention provides a method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station, in order to solve the problems of poor welding quality and low welding efficiency of pyramidal steel pipe flanges in the prior art, which affect production efficiency.

[0005] The technical solution is as follows:

[0006] A method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station, the key of which is: the steel pipe welding station includes a closed-loop rotating clamping seat, a floating support device and several welding robotic arms, and is carried out according to the following steps: S1, the steel pipe body to be welded is initially welded to the flange, so that the flanges at both ends of the steel pipe body to be welded are coaxially set with it.

[0007] S2, the steel pipe body to be welded after completing the first step is hoisted to the steel pipe welding station. The front part of the steel pipe body to be welded is clamped by the closed-loop rotary clamping seat, and the rear part of the steel pipe body to be welded is supported by the floating support device. The spatial position of the steel pipe body to be welded is adjusted by the floating support device so that the axis of the steel pipe body to be welded is perpendicular to the rotation surface when the closed-loop rotary clamping seat drives the steel pipe body to be welded to rotate.

[0008] S3, activate the closed-loop rotary clamping seat to make the steel pipe body to be welded rotate continuously in one direction, and at the same time, the welding robotic arm welds the gap between the flanges at both ends and the steel pipe body to be welded.

[0009] Using the above scheme, during welding, a closed-loop rotating clamp is used to hold the front end of the steel pipe, enabling the steel pipe to rotate 360°. The rear end is supported by a floating support device to ensure that the axis of the steel pipe remains horizontal and aligned front to back during rotation. This prevents the rotation plane of the steel pipe from becoming skewed, ensuring more precise welding positions between the flange and the steel pipe, greatly improving welding quality. Furthermore, the use of a welding robotic arm to cooperate with the 360° rotation of the steel pipe avoids welding blind spots and allows for continuous welding, which helps improve welding efficiency and ensures weld uniformity, thus increasing the production efficiency of finished steel pipes.

[0010] Preferably, the floating support device includes a support base A and a floating support assembly. The support base A has an open arc-shaped groove at the top. The floating support assembly includes a support wire, two fixed pulleys A symmetrically arranged at the upper end of the arc-shaped groove, a wire roller located directly below the fixed pulleys A, and a wire follower motor for driving the wire roller to rotate. One end of the support wire is wound around one of the wire rollers, passes through the two fixed pulleys A in sequence, and the other end is fixed to the other wire roller.

[0011] In step S3, when the steel pipe body to be welded rotates, the steel wire follower motor drives the support steel wire to rotate synchronously with the steel pipe body to be welded.

[0012] By adopting the above scheme, during the welding process, the supporting steel wire is used to achieve floating support for the rear end of the steel pipe. The height and left and right position of the rear end of the steel pipe can be adjusted by loosening or tightening the steel wire with the help of the steel wire follower motor. This helps to ensure the centering of the front and rear ends of the steel pipe. At the same time, during the rotation of the steel pipe, the steel wire follower motor pulls the steel wire to slide, reducing the relative friction between the steel wire and the steel pipe. This helps to ensure the rotational stability of the steel pipe, thereby further improving the uniformity of the weld and reducing the wear on the coating on the surface of the steel pipe.

[0013] Preferably, the steel pipe welding station includes a central support device located between the closed-loop rotary clamping seat and the floating support device. The central support device includes a support base B and a lifting seat disposed on the support base B. The support base B is provided with a lifting adjustment mechanism for driving the lifting seat to rise and fall.

[0014] The lifting seat has two roller seats distributed along the width direction of the guide rail frame A, and a distance adjustment mechanism for driving the two roller seats to move closer or further apart synchronously. Each roller seat has at least one roller, which is inclined upwards.

[0015] The floating support device is equipped with a clamping component A. In step S2, the steel pipe body to be welded is first hoisted onto the middle support device and the floating support device by the hoisting equipment, and the rear of the steel pipe body to be welded is clamped by the clamping component A. Then, the floating support device moves to push the steel pipe body to be welded into the working area of ​​the closed-loop rotary clamping seat. After the closed-loop rotary clamping seat clamps the steel pipe body to be welded, the lifting seat descends and disengages from the support of the steel pipe body to be welded.

[0016] Using the above scheme, the central support device can assist in supporting the front end of the steel pipe. Before welding, the steel pipe is hoisted onto the central support device and the floating support device using hoisting equipment. After adjusting their respective heights so that the front end of the steel pipe is directly facing the closed-loop clamping seat, the floating support device can be moved forward to push the steel pipe into the working area of ​​the closed-loop rotary clamping seat. Compared with directly hoisting and moving the steel pipe to the working area of ​​the closed-loop rotary clamping seat using hoisting equipment, the operation is easier and more convenient with the help of the central support device, which is conducive to improving hoisting efficiency and reducing operational risks.

[0017] Preferably, after the welding of the steel pipe body is completed, the lifting seat rises and supports the welded steel pipe, the closed-loop rotary clamping seat releases its grip on the welded steel pipe, the clamping component A clamps the welded steel pipe and drags it out of the working area of ​​the closed-loop rotary clamping seat, and then the welded steel pipe is lifted away by hoisting equipment. This solution further reduces the hoisting risks during production and improves the safety factor.

[0018] Preferably, the welding robotic arm includes at least one welding robotic arm A for welding the outer gap and triangular rib between the pyramidal steel pipe and the flange, and at least two welding robotic arms B for welding the inner gap between the pyramidal steel pipe and the flange. With this design, when the steel pipe rotates, the welding of the inner gaps at both ends can be completed by the two welding robotic arms B, while the welding robotic arm A, moving via a linear guide rail, can complete the welding of the outer gap, thus improving welding efficiency.

[0019] Preferably, the steel pipe welding station includes a guide rail frame A, on which the floating support device and the central support device are both mounted and can slide along the length of the guide rail frame A to approach or move away from the closed-loop rotary clamping seat. With this design, the floating support device and the central support device can slide along the guide rail frame, better accommodating steel pipes of different lengths and facilitating the easier removal and insertion of steel pipes into the working area of ​​the closed-loop rotary clamping seat, reducing operational difficulty and improving production efficiency.

[0020] Preferably, the closed-loop rotary clamping seat includes a support base C, one side of which has a rotating disk mounted by a turntable bearing, the turntable bearing having external teeth, and the support base C is provided with a drive motor for driving the turntable bearing to rotate.

[0021] The rotating turntable has at least three clamping assemblies B evenly distributed along its circumference. Each clamping assembly B includes a clamping head B and a clamping motor B for driving the clamping head B to move towards the center of the rotating turntable. Using this scheme, the turntable's bearings enable 360° rotation, and the clamping assemblies B assist in clamping the steel pipe, ensuring welding can be completed in all circumferential areas and effectively improving the stability of the steel pipe's rotation process.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station provided by this invention can fully ensure the stability of the rotating plane of the steel pipe during the welding process, prevent skewing, improve welding quality, extend service life, and enable continuous welding with 360° rotation, further improving welding quality and efficiency, i.e., increasing the production efficiency of finished steel pipes for iron towers. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steel pipe welding station in this invention;

[0025] Figure 2 for Figure 1 Axonometric drawing;

[0026] Figure 3 This is a schematic diagram showing the layout of the closed-loop rotary clamping seat, the floating support device, and the central support device.

[0027] Figure 4 for Figure 3 Side view;

[0028] Figure 5 A schematic diagram of a closed-loop rotary clamping seat structure;

[0029] Figure 6 for Figure 5 Axonometric drawing;

[0030] Figure 7 for Figure 5 Exploded view;

[0031] Figure 8 This is a schematic diagram of the floating support device structure;

[0032] Figure 9 for Figure 8 Axonometric drawing;

[0033] Figure 10 For central support device;

[0034] Figure 11 for Figure 10 Side view;

[0035] Figure 12 This is a schematic diagram of clamping component A.

[0036] Figure 13 This is a schematic diagram of the B400 welding robotic arm.

[0037] Figure 14 This is a schematic diagram of the working status of the steel pipe welding station;

[0038] Figure 15 This is a schematic diagram of the finished structure of a pyramidal steel pipe welded together. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings.

[0040] refer to Figures 1 to 15 The method shown is to weld large-diameter pyramidal steel pipe flanges using a steel pipe welding station. The key point is based on the use of the steel pipe welding station, which mainly includes a closed-loop rotary clamping seat 100, a floating support device 200 and several welding robotic arms. The process is carried out in the following steps: First, the steel pipe body to be welded is initially welded to the flange so that the flanges at both ends of the steel pipe body to be welded are coaxially set with it.

[0041] The second step is to hoist the steel pipe body to be welded, which has completed the first step, to the steel pipe welding station. The front part of the steel pipe body to be welded is clamped by the closed-loop rotary clamping seat 100, and the rear part of the steel pipe body to be welded is supported by the floating support device 200. The spatial position of the steel pipe body to be welded is adjusted by the floating support device 200 so that the axis of the steel pipe body to be welded is perpendicular to the rotation surface when the closed-loop rotary clamping seat 100 drives the steel pipe body to be welded to rotate.

[0042] The third step involves activating the closed-loop rotary clamping seat 100, causing the steel pipe body to be welded to rotate continuously in one direction, while simultaneously welding the gap between the flanges at both ends and the steel pipe body using the welding robotic arm.

[0043] In this embodiment, for ease of understanding, the structure of the steel pipe welding station is first described in detail, as shown in the figure. The closed-loop rotating clamping seat 100 is used to clamp and support the front end of the pyramidal steel pipe and can drive the pyramidal steel pipe to be welded to rotate 360°. The floating support device 200 is used to support the rear end of the pyramidal steel pipe and can adjust the height of the rear end of the supported pyramidal steel pipe so that the axis of the pyramidal steel pipe is perpendicular to its rotation plane.

[0044] In specific implementation, the welding robotic arms include at least one welding robotic arm A300 and two welding robotic arms B400. Welding robotic arm A300 is used to weld the outer gap and triangular rib between the pyramidal steel pipe and the flange, while welding robotic arms B400 are located in front of the closed-loop rotary clamping seat 100 and behind the floating support device 200, respectively, and are used to weld the inner gap between the pyramidal steel pipe and the flange.

[0045] In this application, when only the closed-loop rotary clamping seat 100 and the floating support device 200 are present, hoisting equipment is required to lift the pyramidal steel pipe to be welded into the clamping space of the closed-loop rotary clamping seat 100 and the support of the floating support device 200 tends to be inward. This places high demands on the operation of the hoisting equipment and is prone to hoisting safety accidents. Therefore, this application also provides a guide rail frame A500 corresponding to the closed-loop rotary clamping seat 100, as shown in the figure. The floating support device 200 and the welding robot arm B400 adjacent to it are both set on the guide rail frame A500 and can slide along the length direction of the guide rail frame A500 to approach or move away from the closed-loop rotary clamping seat 100. The middle part of the guide rail frame A500 has a rack 510 arranged horizontally along its length direction, and the guide rail frame A500 has guide rails 520 symmetrically arranged on both sides of the rack 510.

[0046] As shown in the figure, the floating support device 200 includes a support base A210 and a floating support assembly 220. The top of the support base A210 has an open arc-shaped slot 211 facing upward. In this embodiment, the arc-shaped slot 211 is generally semi-circular, and there are symmetrically arranged lugs 212 on both sides.

[0047] The floating support assembly 220 includes a support wire 224, two fixed pulleys A221 symmetrically arranged on the upper end of the arc-shaped groove 211, a wire roller 222 located directly below the fixed pulleys A221, and a wire follower motor 223 for driving the wire roller 222 to rotate. As shown in the figure, the fixed pulleys A221 are arranged on the lugs 212, and their rotation plane is parallel to the radial section of the arc-shaped groove 211. The wire roller 222 is rotatably supported on the support. At the lower part of the base A210, one end of the support wire 224 is wound around one of the wire rollers 222, passes through two fixed pulleys A221 in sequence, and the other end is fixed to another wire roller 222. The support wire 224 can be wound and unwound by rotating one of the wire rollers 223, or the two wire rollers 223 can work synchronously in opposite directions to make the support wire 224 wind from the wire roller 222 to the other wire roller 222. At the same time, a resistance tensioning component 250 is provided on the lug 212 at the position corresponding to the support wire 224. By tensioning and clamping the support wire 224, it helps to maintain the initial arc shape of the wire.

[0048] In addition, clamping components A230 are provided on both sides and the bottom of the arc-shaped slot 211 on the support base A210, as shown in the figure. In this embodiment, there are three sets of clamping components A230, two of which are located on the two lugs 212 respectively. The bottom of the arc-shaped slot 211 is a hollow cavity, and the third set of clamping components A230 is located in the hollow cavity. The three sets of clamping components A230 are distributed in an isosceles triangle. Each set of clamping components A230 mainly includes a clamping head A231 and a clamping motor A232 for driving the clamping head A231 to approach or move away from the arc-shaped slot 211. When the steel pipe moves horizontally, the clamping components A are used to hold the steel pipe tightly, which can avoid or alleviate the axial sway of the steel pipe, ensure overall stability, and reduce overload damage.

[0049] In practice, the clamping head A231 is fixed to the support base A210 via the support guide seat A233. There is a guide structure between the clamping head A231 and the support guide seat A233. At the same time, the clamping motor A232 drives the clamping head A231 to extend or retract via the worm gear transmission structure. The front end of the worm is rotatably connected to the clamping head A231. The guide structure is usually a guide rod fixedly connected to the clamping head A231, and the guide rod is slidably engaged with the support guide seat A233.

[0050] The bottom ends of the support base A210 are slidably engaged with the guide rail 520. A walking motor A240 is located near the middle of the bottom. The motor shaft of the walking motor A240 is vertically downward and has a gear that meshes with the rack 510. When the walking motor A240 is working, it can drive the floating support device 200 to slide along the length of the guide rail 520 to adjust the linear distance between it and the closed-loop rotating clamping seat 100.

[0051] As mentioned earlier, the operation of directly hoisting the working area of ​​the closed-loop rotary clamping seat 100 by hoisting equipment is quite difficult. Therefore, in this embodiment, in order to further reduce the difficulty of the welding process and improve the efficiency of the welding operation, the steel pipe welding station is also equipped with a central support device 600. As shown in the figure, the central support device 600 is also set on the guide rail frame A500 and is located between the closed-loop rotary clamping seat 100 and the floating support device 200.

[0052] The central support device 600 includes a support base B610 and a lifting seat 620 disposed on the support base B610. The support base B610 is provided with a lifting adjustment mechanism 630 for driving the lifting seat 620 to rise and fall. Specifically, the lifting seat 620 has vertically arranged lifting guide rods 631 at both ends. The lifting guide rods 631 and the support base B610 are slidably engaged by linear bearings. The support base B610 is generally U-shaped, and a lifting drive motor 632 is disposed in the middle. The lifting seat 620 has a vertically arranged worm gear 633 in the middle. The lifting drive motor 632 also drives the worm gear 633 to rise and fall through a worm gear transmission structure, thereby driving the lifting seat 620 to rise and fall. Of course, the lifting of the lifting seat 620 can also be directly driven by a hydraulic rod, etc., all of which are within the scope of protection of this application.

[0053] Meanwhile, the lifting seat 620 has two roller seats 621 distributed along the width direction of the guide rail frame A500, and a distance adjustment mechanism 650 for driving the two roller seats 621 to move closer or further apart synchronously. Each roller seat 621 has at least one roller 622, which is inclined upwards. As shown in the figure, the rollers 622 at the left and right ends of the lifting seat 620 are distributed at an angle of approximately 90°-120°. The roller seats 621 are detachably installed on the lifting seat 620, and the roller seats 621 can be replaced as needed to adjust the inclination angle of the rollers 622.

[0054] The distance adjustment mechanism 650 mainly includes a lead screw motor 651. As shown in the figure, the lead screw 652 of the lead screw motor 651 is arranged along the length direction of the lifting seat 620. The bottom of the roller seat 621 is slidably engaged with the lifting seat 620, and can slide relative to each other along the length direction of the lifting seat 620. At the same time, the bottom of the roller seat 621 has a nut seat that is threadedly engaged with the lead screw motor 651. It should be noted that the threads of the nut seats at the bottom of the two roller seats 621 are opposite. In this way, when the lead screw motor 651 works, the roller seats 621 move towards each other, ensuring that the two move closer or further away at the same time, thus fully guaranteeing the centering of the support.

[0055] A walking motor B640 is located at the bottom of the support base B610 near the middle. The motor shaft of the walking motor B640 is vertically downward and has a gear that meshes with the rack 510. When the walking motor B640 is working, it can drive the central support device 600 to slide along the length of the guide rail 520 to adjust the linear distance between it and the closed-loop rotary clamping seat 100.

[0056] In this application, the closed-loop rotary clamping seat 100 includes a support base C110. One side of the support base C110 has a rotating disk 130 mounted via a turntable bearing 120. The turntable bearing 120 has external teeth. The support base C110 is provided with a drive motor 140 for driving the turntable bearing 120 to rotate. As shown in the figure, the support base C110 is composed of a mounting frame 111 that is generally polygonal in shape at the top and a rectangular frame base 112 that is integrally connected to the mounting frame 111 at the bottom. The turntable bearing 120 is coaxially mounted with the mounting frame 111, which can fully ensure the overall stability of the support base C110. The drive motor 140 is located below the mounting frame 111, and its motor shaft has a rotating gear 141 that meshes with the turntable bearing 120.

[0057] The rotating turntable 130 has at least three clamping assemblies B150 evenly distributed along its circumference, as shown in the figure. The structure of the clamping assembly B150 is basically similar to that of the clamping assembly A230. Each clamping assembly B150 includes a clamping head B151 and a clamping motor B152 for driving the clamping head B151 to move towards the center of the rotating turntable 130. In a specific implementation, the rotating turntable 130 has a support guide seat B153 that corresponds one-to-one with the clamping head B151. The clamping head B151 and the support guide seat B153 have a mutually cooperating guide structure, and the movement direction of the clamping head B151 is along the radial direction of the rotating turntable 130. The clamping head B151 can be set on the support guide seat B153 through a linear transmission rod. The clamping motor B152 drives the clamping head B151 to move linearly through a transmission mechanism. In this application, there are four sets of clamping assemblies B150, evenly distributed along the circumference of the rotating turntable 130.

[0058] In this embodiment, the rotating turntable 130 is located on one side close to the floating support device 200, and the other side of the support base C110 is provided with a protective frame 113 to prevent the flange from accidentally falling off during the welding process.

[0059] When there is only one welding robot arm A300, one side of the guide rail frame A500 has a guide rail frame B700 arranged parallel to it. The welding robot arm A300 is slidably mounted on the guide rail frame B700 and can slide along the length of the guide rail frame B700 to a position corresponding to the front and rear ends of the pyramidal steel pipe to be processed. This improves the utilization rate of the welding robot arm A300 and reduces the initial investment cost.

[0060] In practice, the guide rail frame A500 is positioned lower than the guide rail frame B700. One welding robotic arm B400 is mounted on the guide rail frame A500 and is equipped with a travel motor C410. Similarly, through the gear and rack 510 on the motor shaft, the welding robotic arm B400 can be driven to slide along the guide rail frame A500 to accommodate steel pipes of different lengths. The other welding robotic arm B400 is positioned in front of the closed-loop rotary clamping seat 100 and is at a higher position, usually at the same installation height as the guide rail frame B700.

[0061] refer to Figures 1 to 15 The method for welding large-diameter pyramidal steel pipe flanges using a steel pipe welding station is shown below. The detailed steps are as follows: First, in the initial welding station, the steel pipe body 800 to be welded and the flange 810 are aligned and initially welded to ensure that the flange 810 and the steel pipe body 800 to be welded are coaxially fixed.

[0062] The second step is to adjust the distance between the middle support device 600 and the floating support device 200 according to the length of the steel pipe body 800 (including flange 810) to be welded. Then, using a hoisting tool, the steel pipe body 800 to be welded is hoisted and placed on the middle support device 600 and the floating support device 200, and the rear of the steel pipe body 800 to be welded is clamped using the clamping assembly A230.

[0063] The third step involves driving the floating support device 200 forward via the walking motor A240, causing the steel pipe body 800 to be welded to roll and rub against the roller 622 until the flange 810 at the large end of the steel pipe body 800 is positioned within the working area of ​​the welding robotic arm B400 via the rotating turntable 130. Simultaneously, the welding robotic arm B400 is driven by the walking motor C410 to approach the rear end of the steel pipe body 800 and place it within its working range.

[0064] Fourth step: clamp the front of the steel pipe body 800 to be welded by clamping component B150, and release clamping component A230. Use floating support component 220 to achieve floating support for the steel pipe body 800 to be welded, and use wire follower motor 223 to retract and extend support wire 224 to ensure that the axis of the steel pipe body 800 to be welded is perpendicular to the rotation plane of rotating turntable 130. The lifting seat 620 is in a lowered state and is no longer in contact with the steel pipe body 800 to be welded.

[0065] In the fifth step, the rotating turntable 130 is driven by the drive motor 140 to rotate, which in turn drives the steel pipe body 800 to be welded to rotate. The two welding robotic arms B400 work to complete the welding of the inner gap between the steel pipe body 800 and the flange 810. Meanwhile, the welding robotic arm A300 slides along the guide rail frame B700 to complete the welding of the outer weld gap between the two, as well as the welding of the triangular rib plate 820 between them. Because the rotating turntable 130 can rotate continuously 360°, the need for rotation to adjust the posture is avoided, which helps to improve the uniformity and flatness of the weld, as well as the welding efficiency.

[0066] During the rotation of the turntable 130, two steel wires follow the motor 223 to work. One wire retracts the support wire 224, and the other retracts the support wire 224. The speed is consistent with the angular velocity of the turntable 130, so as to avoid the longitudinal sway of the front and rear ends of the steel pipe body 800 to be welded during the rotation, which would affect the welding quality.

[0067] Step 6: After the welding of the steel pipe body is completed, the lifting seat 620 rises and supports the welded steel pipe. The closed-loop rotary clamping seat 100 releases its clamp on the welded steel pipe, the clamping component A230 clamps the welded steel pipe, and the traveling motor A240 works to drag and move the welded steel pipe out of the working area of ​​the closed-loop rotary clamping seat 100. Alternatively, the traveling motor B640 can work synchronously with the traveling motor A240 to support and move the welded steel pipe out. Finally, the welded steel pipe is lifted away by the hoisting equipment, which greatly reduces the hoisting risk.

[0068] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A method for welding flanges of large-diameter pyramidal steel pipes using a steel pipe welding station, characterized by: The steel pipe welding station comprises a closed-loop rotary clamping seat (100), a floating support device (200) and a plurality of welding mechanical arms, and the following steps are performed: S1, the flanges at both ends of the steel pipe body to be welded are coaxially arranged by performing initial welding on the steel pipe body to be welded and the flanges; S2, the steel pipe body to be welded is hoisted to the steel pipe welding station, the front part of the steel pipe body to be welded is clamped by the closed-loop rotary clamping seat (100), the rear part of the steel pipe body to be welded is supported by the floating support device (200), and the spatial position of the steel pipe body to be welded is adjusted by the floating support device (200) so that the axis of the steel pipe body to be welded is perpendicular to the rotation surface of the closed-loop rotary clamping seat (100) when the closed-loop rotary clamping seat (100) drives the steel pipe body to be welded to rotate; S3, the closed-loop rotary clamping seat (100) is started to continuously rotate the steel pipe body to be welded in one direction, and the gaps between the flanges at both ends and the steel pipe body to be welded are welded by the welding mechanical arms; The floating support device (200) comprises a support base A (210) and a floating support assembly (220), the support base A (210) has an arc-shaped notch (211) with an open top, the floating support assembly (220) comprises a support wire (224), two fixed pulleys A (221) symmetrically arranged at the upper end of the arc-shaped notch (211), a wire roller (222) located directly below the fixed pulleys A (221), and a wire follow-up motor (223) for driving the wire roller (222) to rotate, one end of the support wire (224) is wound on one of the wire rollers (222), passes through the two fixed pulleys A (221) in sequence, and the other end is fixed on the other wire roller (222); In step S3, when the steel pipe body to be welded rotates, the wire follow-up motor (223) drives the support wire (224) to rotate synchronously with the steel pipe body to be welded; The steel pipe welding station comprises a middle support device (600) located between the closed-loop rotary clamping seat (100) and the floating support device (200), the middle support device (600) comprises a support base B (610) and a lifting seat (620) arranged on the support base B (610), and the support base B (610) is provided with a lifting adjustment mechanism (630) for driving the lifting seat (620) to lift; The lifting seat (620) has two roller seats (621) distributed along the width direction of the guide rail frame A (500), and a distance adjustment mechanism (650) for driving the two roller seats (621) to approach or move away synchronously, at least one roller (622) is arranged on each roller seat (621), and the rollers (622) are inclined upward. The floating support device (200) is provided with a clamping assembly A (230), in step S2, first, the to-be-welded steel pipe body is hoisted to the middle support device (600) and the floating support device (200) by hoisting equipment, and the rear part of the to-be-welded steel pipe body is clamped by the clamping assembly A (230), then the floating support device (200) moves to push the to-be-welded steel pipe body into the working area of the closed-loop rotary clamping seat (100), when the closed-loop rotary clamping seat (100) clamps the to-be-welded steel pipe body, the lifting seat (620) is lowered to be separated from the support of the to-be-welded steel pipe body.

2. The method of claim 1, wherein the method is characterized by: When the to-be-welded steel pipe body is welded, the lifting seat (620) is raised to support the welded steel pipe, the closed-loop rotary clamping seat (100) is loosened to clamp the welded steel pipe, the clamping assembly A (230) clamps the welded steel pipe and drags it to move out of the working area of the closed-loop rotary clamping seat (100), and then the welded steel pipe is hoisted away by hoisting equipment.

3. The method of welding flanges of large-diameter pyramidal steel pipes using a steel pipe welding station according to claim 1 or 2, characterized in that: The welding mechanical arm includes at least one welding mechanical arm A (300) for welding the outer gap and triangular rib plate between the pyramid-shaped steel pipe and the flange, and at least two welding mechanical arms B (400) for welding the inner gap between the pyramid-shaped steel pipe and the flange.

4. The method of claim 3, wherein the method is characterized by: The steel pipe welding station includes a guide rail frame A (500), the floating support device (200) and the middle support device (600) are arranged on the guide rail frame A (500) and can slide along the length direction of the guide rail frame A (500) to approach or move away from the closed-loop rotary clamping seat (100).

5. The method of welding flanges of large-diameter pyramidal steel pipes using a steel pipe welding station according to claim 1 or 2, characterized in that: The closed-loop rotary clamping seat (100) includes a support base C (110), one side of the support base C (110) is provided with a rotary turntable (130) installed through a rotary turntable bearing (120), the rotary turntable bearing (120) has an outer gear, and the support base C (110) is provided with a driving motor (140) for driving the rotary turntable bearing (120) to rotate. The rotary turntable (130) is provided with at least three clamping assemblies B (150) uniformly distributed along the circumferential direction thereof, the clamping assembly B (150) includes a clamping head B (151) and a clamping motor B (152) for driving the clamping head B (151) to move towards the center of the rotary turntable (130).

Images