Pylon flange welding station for transmission tower

Abstract

The application discloses a kind of pyramidal steel pipe flange welding workstations for power transmission tower, including closed loop type rotary clamping seat, for clamping and supporting the front end of pyramidal steel pipe, and can drive pyramidal steel pipe 360 ° rotation;Floating support device, for supporting the rear end of pyramidal steel pipe, and can adjust the height of supporting the rear end of pyramidal steel pipe, so that the axis of pyramidal steel pipe and its rotation plane are perpendicular to each other;At least one welding mechanical arm A, for welding the outer gap between pyramidal steel pipe and flange and triangular rib plate;At least two welding mechanical arms B are respectively located in front of closed loop type rotary clamping seat and rear of floating support device, for welding the inner gap between pyramidal steel pipe and flange.Welding process can fully guarantee the stability of steel pipe rotation plane, prevent deflection, help to improve welding quality, prolong service life, and can be 360 ° rotation continuous welding completion, greatly improve welding quality and efficiency, that is, improve the production efficiency of finished product steel pipe for iron tower.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tower production equipment, and particularly relates to a pyramidal steel pipe flange welding workstation for a power transmission tower. BACKGROUND

[0002] The power transmission tower is mainly divided into two types according to the main structure, one is built by angle steel, and the other is formed by vertically stacking and connecting conical steel pipes. This tower is also called a steel pipe tower. The steel pipe tower is conical as a whole, so the single steel pipe is also conical in the length direction. In order to improve the overall strength and stability, the steel pipe cross section is also polygonal structure, that is, the steel pipe is a pyramidal structure. Therefore, before assembly, the flange plate needs to be welded at both ends of the steel pipe. The welding quality of the flange plate directly affects the connection quality between the adjacent two steel pipes.

[0003] The key of flange welding is the welding of inner and outer gaps and the welding of triangular rib plates with the steel pipe. Because of the special structure of the steel pipe, the axis is easy to deflect relative to the rotation direction during rotation, which causes the position to deviate during gap welding, resulting in unbalanced tension in the weld. Under pressure, the flange is easy to deflect and deform, which ultimately affects the service life of the tower. Therefore, in the prior art, the welding of the inner and outer gaps is basically carried out by rotating the steel pipe without moving it, which greatly increases the labor intensity of the workers, and the welding efficiency is low, which hinders the improvement of production efficiency and limits the production capacity. SUMMARY

[0004] Therefore, the present application provides a pyramidal steel pipe flange welding workstation for a power transmission tower to solve the problems of poor welding quality of the pyramidal steel pipe flange, low welding efficiency and the like in the prior art.

[0005] The technical scheme is as follows:

[0006] A pyramidal steel pipe flange welding workstation for a power transmission tower, the key of which is that it comprises:

[0007] A closed-loop rotary clamping seat for clamping and supporting the front end of the pyramidal steel pipe and capable of driving the pyramidal steel pipe to rotate 360°;

[0008] A floating support device for supporting the rear end of the pyramidal steel pipe and capable of adjusting the height of the rear end of the pyramidal steel pipe to make the axis of the pyramidal steel pipe perpendicular to the rotation plane thereof;

[0009] A welding mechanical arm A for welding the outer gap and the triangular rib plate between the pyramidal steel pipe and the flange;

[0010] At least two welding mechanical arms B are respectively arranged in front of the closed-loop rotary clamping seat and behind the floating support device, and are used for welding the inner gap between the pyramid-shaped steel pipe and the flange.

[0011] The guide rail frame A and the guide rail frame B are arranged in parallel, the floating support device and the welding mechanical arm B close to the floating support device are arranged on the guide rail frame A, and can slide along the length direction of the guide rail frame A to approach or move away from the closed-loop rotary clamping seat.

[0012] The middle part of the guide rail frame A is provided with a rack arranged horizontally along the length direction of the guide rail frame A, and the guide rail frame A is provided with symmetrical guide rails on both sides of the rack.

[0013] The welding mechanical arm A is arranged in a slidable manner on the guide rail frame B, and can slide along the length direction of the guide rail frame B to the position opposite to the front and back ends of the pyramid-shaped steel pipe to be machined.

[0014] By using the above scheme, the 360° rotation of the steel pipe is realized by clamping the front end of the steel pipe by the closed-loop rotary clamping seat during welding, and the rear end is supported by the floating support device, so that the axis of the steel pipe remains horizontal during rotation, that is, the rotation plane of the steel pipe is prevented from being inclined, so as to ensure that the welding position between the flange and the steel pipe is more accurate, greatly improves the welding quality, and avoids the welding blind area by using the welding mechanical arm to cooperate with the 360° rotation of the steel pipe, so that the welding is completed at one time, which is beneficial to improve the welding efficiency, that is, the production efficiency of the finished steel pipe, and the floating support device and the welding mechanical arm B close to the floating support device can slide on the guide rail frame A to adapt to steel pipes of different lengths, which is beneficial to enhance the application range, and the arrangement of the guide rail frame B is beneficial to improve the utilization efficiency of the welding mechanical arm A and reduce the implementation cost.

[0015] As a preferred, the floating support device comprises a support base A and a floating support assembly, the top of the support base A is provided with an arc-shaped slot opening upward, the floating support assembly comprises a support wire, two fixed pulleys A symmetrically arranged on the upper end of the arc-shaped slot, a wire roller located directly below the fixed pulley A, and a wire follow-up motor for driving the rotation of the wire roller, one end of the support wire is wound on one of the wire rollers, passes through the two fixed pulleys A in turn, and the other end is fixed on the other wire roller. By using the above scheme, the floating support of the rear end of the steel pipe is realized by using the support wire, and the height and left-right position of the rear end of the steel pipe can be adjusted by loosening or tightening the wire by using the wire follow-up motor, which is beneficial to ensure the centering of the front and rear ends of the steel pipe, and in the process of rotating the steel pipe, the wire follow-up motor is used to pull the wire to slide, so as to reduce the relative friction between the wire and the steel pipe, which is beneficial to ensure the stability of the rotation of the steel pipe and reduce the wear of the surface coating of the steel pipe.

[0016] As preferred: both sides and the bottom of the arc-shaped notch on the support base A are provided with clamping assemblies A, which are isosceles triangle distributed, and include clamping heads A and clamping motors A for driving the clamping heads A to approach or move away from the arc-shaped notch. With the above scheme, when the steel pipe moves horizontally, the clamping assembly A can tightly hold the steel pipe, so as to avoid or alleviate the axial shaking amplitude of the steel pipe, ensure the overall stability, and reduce the overloading damage.

[0017] As preferred: it further includes a middle support device arranged on the guide rail frame A, which is located between the closed-loop rotary clamping seat and the floating support device;

[0018] The middle support device includes a support base B and a lifting seat arranged on the support base B, and the support base B is provided with a lifting adjustment mechanism for driving the lifting seat to lift;

[0019] 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 synchronously approach or move away, and at least one roller is arranged on the roller seat and is upwardly inclined.

[0020] The middle support device can assist in supporting the front end of the steel pipe. Before welding, the steel pipe is hoisted by hoisting equipment to the middle support device and the floating support device, the heights of the two are adjusted, and the front end of the steel pipe is opposite to the closed-loop rotary clamping seat, then the steel pipe is pushed forward to the working area of the closed-loop rotary clamping seat by the floating support device, and after welding, the steel pipe can also be assisted to exit the area. Compared with directly hoisting the steel pipe into or out of the working area of the closed-loop rotary clamping seat by hoisting equipment, the operation difficulty is smaller, the implementation is facilitated, the hoisting efficiency is improved, and the operation risk is reduced.

[0021] As preferred: the closed-loop rotary clamping seat includes a support base C, one side of the support base C is provided with a rotary turntable arranged through a turntable bearing, the turntable bearing has external teeth, and the support base C is provided with a driving motor for driving the turntable bearing to rotate;

[0022] The rotary turntable has at least three clamping assemblies B uniformly distributed along the circumferential direction thereof, and the 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 rotary turntable. With the above scheme, the 360° rotation of the rotary turntable is realized by the turntable bearing, and the steel pipe is clamped by the clamping assembly B, so as to ensure that the welding in all areas in the circumferential direction can be completed.

[0023] As preferred: the rotary turntable is located on the side close to the floating support device. With the above scheme, the space occupation of the welding working area can be reduced, and the utilization rate of the idle space can be improved.

[0024] As preferred: the support base B is in sliding fit with the guide rail, and a walking motor B is arranged on the support base B for driving the support base B to slide along the guide rail. With the above scheme, the position of the middle support device can be better adjusted to adapt to steel pipes of different lengths.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The pyramid-shaped steel pipe flange welding workstation for power transmission towers can fully ensure the stability of the rotating plane of the steel pipe during welding, prevent deflection, improve the welding quality and prolong the service life, and can be continuously rotated by 360 degrees to complete welding, fully ensure the continuity and uniformity of the weld, and greatly improve the welding quality and efficiency, that is, the production efficiency of the finished steel pipe for towers. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of the present application;

[0028] Figure 2 is Figure 1 an axonometric view;

[0029] Figure 3 is a layout schematic view of the closed-loop rotary clamping seat, the floating support device and the middle support device;

[0030] Figure 4 is Figure 3 a side view;

[0031] Figure 5 is a structural schematic view of the closed-loop rotary clamping seat;

[0032] Figure 6 is Figure 5 an axonometric view;

[0033] Figure 7 is Figure 5 an exploded view;

[0034] Figure 8 is a structural schematic view of the floating support device;

[0035] Figure 9 is Figure 8 an axonometric view;

[0036] Figure 10 is a middle support device;

[0037] Figure 11 is Figure 10 a side view;

[0038] Figure 12 is a structural schematic view of the clamping assembly A;

[0039] Figure 13 Fig. 1 is a structural schematic diagram of a welding mechanical arm B400;

[0040] Figure 14 Fig. 4 is a schematic diagram of a use state of the present application;

[0041] Figure 15 Fig. 5 is a structural schematic diagram of a finished product of a pyramid-shaped steel pipe welding. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below with reference to the accompanying drawings.

[0043] Reference Figures 1 to 15 The pyramid-shaped steel pipe flange welding workstation shown in the figure mainly comprises a closed-loop rotary clamping seat 100, a floating support device 200, at least one welding mechanical arm A300 and at least two welding mechanical arms B400, wherein the closed-loop rotary clamping seat 100 is used to clamp the front end of the pyramid-shaped steel pipe and can drive the pyramid-shaped steel pipe to rotate by 360°, the floating support device 200 is used to support the rear end of the pyramid-shaped steel pipe and can adjust the height of the rear end of the pyramid-shaped steel pipe to make the axis of the pyramid-shaped steel pipe perpendicular to its rotation plane.

[0044] The welding mechanical arm A300 is used to weld the outer gap and triangular rib plate between the pyramid-shaped steel pipe and the flange, and the two welding mechanical arms B400 are respectively located in front of the closed-loop rotary clamping seat 100 and behind the floating support device 200 to weld the inner gap between the pyramid-shaped steel pipe and the flange.

[0045] When only the closed-loop rotary clamping seat 100 and the floating support device 200 are provided, a hoisting device is needed to hoist and transport the pyramid-shaped steel pipe to be welded to the clamping space of the closed-loop rotary clamping seat 100 and the support of the floating support device 200 tends to be inward, which requires a relatively high operation requirement for the hoisting device and is prone to hoisting safety accidents. Therefore, the present application further 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 mechanical arm B400 close to it are both arranged 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 the length direction thereof, and the guide rail frame A500 has symmetrical guide rails 520 arranged on both sides of the rack 510.

[0046] In specific implementation, the floating support device 200 comprises a support base A210 and a floating support assembly 220, the top of the support base A210 has an arc-shaped notch 211 with an open top, in the present embodiment, the arc-shaped notch 211 is generally semicircular and has symmetrical lugs 212 arranged on both sides thereof.

[0047] The floating support assembly 220 comprises a support wire 224, two symmetrical pulleys A 221 arranged on the upper end of the arc-shaped notch 211, a wire roller 222 arranged directly below the pulley A 221, and a wire servo motor 223 for driving the wire roller 222 to rotate. As shown in the figure, the pulley A 221 is arranged on the lug 212, and the rotating plane thereof is parallel to the radial cross section of the arc-shaped notch 211. The wire roller 222 is rotatably supported on the lower part of the support base A 210. One end of the support wire 224 is wound around one of the wire rollers 222, and the other end is fixed to the other wire roller 222 after passing through the two pulleys A 221 in sequence. The support wire 224 can be retracted or extended by rotating one of the wire servo motors 223. The two wire servo motors 223 can also work synchronously and reversely to make the support wire 224 wind around from one wire roller 222 to the other wire roller 222. At the same time, a resistance tensioning assembly 250 is arranged on the lug 212 corresponding to the position of the support wire 224, which is beneficial to ensure the initial arc shape of the wire by clamping the support wire 224 under tension.

[0048] In addition, the support base A 210 is provided with clamping assemblies A 230 corresponding to the two sides and the bottom of the arc-shaped notch 211. As shown in the figure, in this embodiment, there are three sets of clamping assemblies A 230, two of which are arranged on the two lugs 212, and the third set of clamping assemblies A 230 is arranged in the hollow chamber at the bottom of the arc-shaped notch 211. The three sets of clamping assemblies A 230 are distributed in an isosceles triangle shape. Each set of clamping assemblies A 230 mainly comprises a clamping head A 231 and a clamping motor A 232 for driving the clamping head A 231 to approach or move away from the arc-shaped notch 211. In specific implementation, the clamping head A 231 is fixed to the support base A 210 through a support guide seat A 233, and a guide structure is arranged between the clamping head A 231 and the support guide seat A 233. Meanwhile, the clamping motor A 232 drives the clamping head A 231 to extend or retract through a worm and gear transmission structure. The front end of the worm is rotatably connected to the clamping head A 231. Generally, the guide structure is a guide rod fixedly connected to the clamping head A 231, and the guide rod is in sliding fit with the support guide seat A 233.

[0049] The two ends of the bottom of the support base A 210 are in sliding fit with the guide rail 520, and a walking motor A 240 is arranged at a position close to the middle of the bottom. The motor shaft of the walking motor A 240 is vertically downward, and has a gear meshing with the rack 510 thereon. When the walking motor A 240 works, it can drive the floating support device 200 to slide along the length direction of the guide rail 520, so as to adjust the straight line distance between the floating support device 200 and the closed-loop rotary clamping seat 100.

[0050] In order to further reduce the operation difficulty of the welding process and improve the welding operation efficiency, a middle support device 600 is also provided in the application, which is arranged on the guide rail frame A500 and located between the closed-loop rotary clamping seat 100 and the floating support device 200.

[0051] The middle support device 600 comprises a support base B610 and a lifting seat 620 arranged on the support base B610. The support base B610 is provided with a lifting adjustment mechanism 630 for driving the lifting seat 620 to lift. Specifically, the lifting seat 620 has vertical lifting guide rods 631 arranged at both ends. The lifting guide rods 631 are slidably connected to the support base B610 through linear bearings. The support base B610 is generally U-shaped, and a lifting drive motor 632 is arranged in the middle part. The lifting seat 620 has a vertical worm 633 arranged in the middle part. The lifting drive motor 632 drives the worm 633 to lift through a worm and gear transmission structure, thereby driving the lifting seat 620 to lift. Of course, the lifting seat 620 can also be directly lifted by a hydraulic rod driving mechanism, which is within the protection scope of the application.

[0052] At the same time, 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 close to or away from each other. At least one roller 622 is arranged on the roller seat 621, and the roller 622 is inclined upward. As shown in the drawings, the rollers 622 at the left and right ends of the lifting seat 620 are distributed at an angle of 90°-120°. The roller seat 621 is detachably mounted on the lifting seat 620, and the roller seat 621 can be replaced as needed to adjust the inclination angle of the roller 622.

[0053] The distance adjustment mechanism 650 mainly comprises a lead screw motor 651. As shown in the drawings, 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 connected to the lifting seat 620 and can slide along the length direction of the lifting seat 620. At the same time, the bottom of the roller seat 621 has a nut seat for threadedly cooperating with the lead screw motor 651. It should be noted that the thread directions of the nut seats at the bottoms of the two roller seats 621 are opposite. When the lead screw motor 651 works, the roller seats 621 move towards each other, ensuring that they move close to or away from each other synchronously, and fully ensuring the centering degree of the support.

[0054] The bottom of the support base B610 is provided with a walking motor B640 near the middle part. The motor shaft of the walking motor B640 is vertically downward, and has a gear for meshing with the rack 510. When the walking motor B640 works, it can drive the whole middle support device 600 to slide along the length direction of the guide rail 520, so as to adjust the straight line distance between the middle support device 600 and the closed-loop rotary clamping seat 100.

[0055] In the present application, the closed-loop rotary clamping seat 100 comprises a support base C110, one side of which is provided with a rotary turntable 130 installed through a turntable bearing 120, the turntable bearing 120 is provided with external teeth, and 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 an upper mounting frame 111 which is generally a regular polygon and a rectangular frame base 112 which is integrated with the mounting frame 111 at the bottom. The turntable bearing 120 is coaxially installed 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 the motor shaft thereof is provided with a rotary gear 141 which engages with the turntable bearing 120.

[0056] The rotary turntable 130 is provided with at least three clamping assemblies B150 which are uniformly distributed along the circumference thereof. As shown in the figure, the structure of the clamping assembly B150 is basically similar to that of the clamping assembly A230. The clamping assembly B150 comprises a clamping head B151 and a clamping motor B152 for driving the clamping head B151 to move towards the center of the rotary turntable 130. In specific implementation, the rotary turntable 130 is provided with a support guide seat B153 corresponding to each clamping head B151, the clamping head B151 and the support guide seat B153 have a matching guide structure therebetween, and the moving direction of the clamping head B151 is along the radial direction of the rotary turntable 130. The clamping head B151 can be arranged on the support guide seat B153 through a straight-line transmission rod, and the clamping motor B152 drives the clamping head B151 to move linearly through a transmission mechanism. In the present application, there are four clamping assemblies B150 which are uniformly distributed along the circumference of the rotary turntable 130.

[0057] In the present embodiment, the rotary turntable 130 is located near the floating support device 200, and the other side of the support base C110 is provided with a protective frame 113 which can prevent the flange from accidentally falling off during welding.

[0058] When there is only one welding mechanical arm A300, one side of the guide rail frame A500 is provided with a guide rail frame B700 which is arranged in parallel therewith. The welding mechanical arm A300 is arranged in a slidable manner on the guide rail frame B700 and can slide along the length direction of the guide rail frame B700 to positions opposite to the front and rear ends of the to-be-processed pyramidal steel pipe. In implementation, the position of the guide rail frame A500 is lower than that of the guide rail frame B700. One of the welding mechanical arms B400 is arranged on the guide rail frame A500 and is provided with a walking motor C410. Similarly, through the gear on the motor shaft and the matching rack 510, the welding mechanical arm B400 can be driven to slide along the guide rail frame A500 to adapt to steel pipes of different lengths. The other welding mechanical arm B400 is arranged in front of the closed-loop rotary clamping seat 100 and is located at a higher position, usually at the same installation height as the guide rail frame B700.

[0059] Reference Figures 1 to 15 The flange welding workstation for the pyramid-shaped steel pipe of the power transmission tower utilizes the steps of welding the steel pipe flange of the present application as follows: in the first step, the pyramid-shaped steel pipe body 800 is aligned and fixed with the flange 810 in the initial welding workstation.

[0060] In the second step, the distance between the middle support device 600 and the floating support device 200 is adjusted according to the length of the pyramid-shaped steel pipe body 800, the pyramid-shaped steel pipe body 800 is hoisted and placed on the middle support device 600 and the floating support device 200 through the hoisting tool, and the rear part of the pyramid-shaped steel pipe body 800 is clamped by the clamping assembly A 230.

[0061] In the third step, the floating support device 200 is driven to move forward by the walking motor A 240, the pyramid-shaped steel pipe body 800 rolls and rubs with the roller 622 until the flange 810 at the large end of the pyramid-shaped steel pipe body 800 passes through the rotating turntable 130 and is within the working range of the welding mechanical arm B 400 in front, and the welding mechanical arm B 400 in the rear is driven to move close to the rear end of the pyramid-shaped steel pipe body 800 and is within the working range by the walking motor C 410.

[0062] In the fourth step, the front part of the pyramid-shaped steel pipe body 800 is clamped by the clamping assembly B 150, the clamping assembly A 230 is loosened, the floating support assembly 220 is utilized to realize the floating support of the pyramid-shaped steel pipe body 800, the support wire 224 is retracted and extended by the wire servo motor 223, the axis of the pyramid-shaped steel pipe body 800 is ensured to be perpendicular to the rotation plane of the rotating turntable 130, the lifting seat 620 is in the lowered state and is separated from the contact with the pyramid-shaped steel pipe body 800.

[0063] In the fifth step, the rotating turntable 130 is driven to rotate by the driving motor 140, that is, the pyramid-shaped steel pipe body 800 is rotated, the front and rear welding mechanical arms B 400 work, the welding of the inner gap between the pyramid-shaped steel pipe body 800 and the flange 810 is completed, and the welding mechanical arm A 300 is slid along the guide rail frame B 700, so that the welding of the outer weld gap between the two and the welding of the triangular rib plate 820 between the two are completed. Because the rotating turntable 130 can continuously rotate by 360°, the rotation adjustment posture is avoided, which is beneficial to improve the welding efficiency.

[0064] During the rotation of the rotating turntable 130, the two wire servo motors 223 work, one retracts the support wire 224 and the other releases the support wire 224, and the speed is consistent with the angular velocity of the rotating turntable 130, so that the length direction of the pyramid-shaped steel pipe body 800 at the front and rear ends is avoided to be deflected during the rotation, thereby affecting the welding quality.

[0065] Finally, it should be noted that the above description is only for the preferred embodiments of the present application, and those of ordinary skill in the art can make various similar expressions under the inspiration of the present application without departing from the purpose and scope of the present application, and such changes fall within the protection scope of the present application.

Claims

1. A pyramidal steel pipe flange welding station for power transmission towers, characterized in that, The application relates to a welding device for a pyramid-shaped steel pipe and a flange. The device comprises the following parts: a closed-loop rotary clamping seat (100) for clamping the front end of a pyramid-shaped steel pipe and capable of driving the pyramid-shaped steel pipe to rotate by 360 degrees; a floating support device (200) for supporting the rear end of the pyramid-shaped steel pipe and capable of adjusting the height of the rear end of the pyramid-shaped steel pipe so that the axis of the pyramid-shaped steel pipe is perpendicular to the rotating plane; a welding mechanical arm A (300) for welding the outer gap between the pyramid-shaped steel pipe and the flange and a triangular rib plate; at least two welding mechanical arms B (400) respectively arranged in front of the closed-loop rotary clamping seat (100) and behind the floating support device (200) and used for welding the inner gap between the pyramid-shaped steel pipe and the flange; parallelly arranged guide rail frames A (500) and B (700), wherein the floating support device (200) and the welding mechanical arm B (400) close to the floating support device (200) are arranged on the guide rail frame A (500) and can slide along the length direction of the guide rail frame A (500) so as to approach or move away from the closed-loop rotary clamping seat (100); the middle part of the guide rail frame A (500) is provided with a rack (510) arranged horizontally along the length direction, and the guide rail frame A (500) is provided with symmetrical guide rails (520) on both sides of the rack (510); the welding mechanical arm A (300) is slidably arranged on the guide rail frame B (700) and can slide along the length direction of the guide rail frame B (700) to the positions opposite to the front and rear ends of the pyramid-shaped steel pipe to be machined; 2. The flange welding station for pyramidal steel tubes of electricity pylons according to claim 1, characterized in that: the floating support device (200) comprises a support base A (210) and a floating support assembly (220), the top of the support base A (210) is provided with an arc-shaped slot (211) with an open top, the floating support assembly (220) comprises support steel wires (224), two symmetrical fixed pulleys A (221) arranged on the upper end of the arc-shaped slot (211), a steel wire roller (222) arranged directly below the fixed pulley A (221), and a steel wire follow-up motor (223) for driving the steel wire roller (222) to rotate, one end of the support steel wire (224) is wound on one of the steel wire rollers (222) and then fixed on the other steel wire roller (222) through the two fixed pulleys A (221).

3. The flanged pyramid-shaped steel pipe welding station for power transmission towers according to claim 1 or 2, characterized in that: corresponding to the arc-shaped slot (211) and the bottom of the support base A (210) are provided with clamping assemblies A (230), the clamping assemblies A (230) are distributed in an isosceles triangular shape and comprise clamping heads A (231) and clamping motors A (232) for driving the clamping heads A (231) to approach or move away from the arc-shaped slot (211). a middle support device (600) arranged on the guide rail frame A (500) is further included, and the middle support device (600) is arranged between the closed-loop rotary clamping seat (100) and the floating support device (200). The middle supporting device (600) comprises a supporting base B (610) and a lifting seat (620) arranged on the supporting base B (610), and the supporting base B (610) is provided with a lifting adjusting mechanism (630) for driving the lifting seat (620) to lift; The lifting seat (620) is provided with two roller seats (621) distributed along the width direction of the guide rail frame A (500), and a distance adjusting mechanism (650) for driving the two roller seats (621) to move close to or away from each other, and at least one roller (622) is arranged on each roller seat (621), and the roller (622) is arranged upwardly and obliquely.

4. The flanged pyramid-shaped steel pipe welding station for power transmission towers according to claim 1 or 2, characterized in that: The closed-loop rotary clamping seat (100) comprises a supporting base C (110), one side of the supporting base C (110) is provided with a rotary turntable (130) installed through a turntable bearing (120), the turntable bearing (120) is provided with an outer gear, and the supporting base C (110) is provided with a driving motor (140) for driving the 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) comprises 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).

5. The flange welding station for pyramidal steel tubes of electricity pylons according to claim 4, characterized in that: The rotary turntable (130) is located on the side close to the floating supporting device (200).

6. The flange welding station for pyramidal steel tubes of electricity pylons according to claim 3, characterized in that: The supporting base B (610) is in sliding fit with the guide rail (520), and is provided with a walking motor B (640) for driving the supporting base B (610) to slide along the guide rail (520).

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