A welding positioning device for steel pipe pole processing and a method thereof

Abstract

The present application belongs to the technical field of steel pipe welding, and discloses a welding positioning device and method for steel pipe rod processing, wherein the device comprises a carrier table, left and right sides of the top end of the carrier table are respectively provided with concave self-rotating fixtures, the concave self-rotating fixtures are used for supporting a pair of placed steel pipe rod workpieces and driving the workpieces to rotate, two symmetrical clamping arm structures are arranged on the carrier table at positions between the two concave self-rotating fixtures, a partition table is fixedly installed below the carrier table, a connecting rod push-pull mechanism is arranged in the middle of the partition table, and power output ends of the connecting rod push-pull mechanism are respectively connected with the left and right clamping arm structures; a turning radial pressing structure is installed on the left and right outer walls of the carrier table, the turning radial pressing structure and the clamping arm structure on the corresponding side are transmissionally connected through a hinge piece, and the upper end of the turning radial pressing structure is provided with a pressing arm mechanism. The present application can synchronously complete positioning operations on two groups of steel pipe rod workpieces at two workstations.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe welding technology, specifically, it relates to a welding positioning device and method for processing steel pipe rods. Background Technology

[0002] In the manufacturing process of circumferential welding of steel pipe poles, welding positioning fixtures are the main tools to ensure their geometric accuracy and weld quality. They forcibly constrain the expansion and contraction of the steel pipe pole during the welding thermal cycle, ensuring that the straightness, ellipticity, and misalignment of the joint of the pole are controlled within the allowable range of the process after welding, while significantly reducing the time for manual marking and alignment. This type of fixture uses a heavy-duty base and a high-precision linear guide as the bearing reference. Multiple sets of independently liftable V-shaped roller supports are arranged longitudinally to adapt to the inherent taper changes of the pole. It is supplemented by lateral tightening screws, upper bridge-type flexible clamping arms, and end axial positioning chucks. During operation, the lifting height of each support is calibrated point by point according to the drawings, so that all support apexes are connected into an inclined straight line that perfectly matches the taper of the pole. After hoisting and positioning and axial coarse positioning are completed, the misalignment at the circumferential joint is repeatedly adjusted to a uniform state by alternating fine adjustment of the side top mechanism and the lifting support, and then the welding operation is carried out.

[0003] Chinese utility model patent application number CN202121432402.0 discloses a positioning fixture for processing high-frequency welded steel pipes with adjustable dimensions. The fixture has an arc-shaped placement plate fixedly installed inside the support base. Support frames are symmetrically erected and fixed on the left and right sides of the top surface of the worktable. Threaded rods are inserted into the crossbeams of the support frames. Internally threaded pipes are fixed on the top surface of the crossbeams of the support frames. Fixing plates are provided on the front and rear sides of the threaded rods. The fixing plates are fixedly installed on the lower side of the crossbeams of the support frames. A lead screw is screwed to the side of the fixing plate away from the threaded rod through a bearing. The drive motor drives the lead screw to rotate, and the lead screw drives the internally threaded sleeve to move. The internally threaded sleeve drives the moving rod to move towards the steel pipe until the clamping plates on both sides clamp the steel pipe.

[0004] The aforementioned existing positioning fixtures clamp and position steel pipes using independently controlled left and right electric clamping units and lifting clamping units, forming a single-station positioning solution. When used in dual-station circumferential welding scenarios, the number of core components such as high-precision guide rails, servo motors, hydraulic cylinders, and pipelines increases exponentially, resulting in high structural costs and a significant increase in footprint. Furthermore, the independent lateral clamping and lifting mechanisms are prone to mechanical interference in space, forcing designers to further increase the station spacing. In addition, two sets of independent left and right electric clamping units and lifting clamping units mean that the operator must simultaneously monitor the gap changes of four radial clamping points, two axial positioning ends, and two docking circumferential seams, which also increases the difficulty of operation. Summary of the Invention

[0005] The purpose of this invention is to provide a welding positioning device and method for processing steel pipe poles. Four steel pipe pole workpieces to be welded are placed in pairs on the left and right sides of the top of a platform, respectively, into concave rotating supports. Then, a linkage push-pull mechanism is activated, driving the clamping arm structures on both sides to move outwards synchronously, gradually bringing them closer to the corresponding concave rotating supports. As the clamping arms unfold, their linkage mechanism simultaneously drives the corresponding radial pressing structure on the flipping side, causing the pressing arm mechanism to flip downwards and firmly press against the outer edges of the two workpieces, thereby achieving reliable positioning of the paired steel pipe pole workpieces and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A welding positioning device for processing steel pipe rods includes a platform. Concave rotating supports are respectively arranged on the left and right sides of the top of the platform. The concave rotating supports are used to support a pair of steel pipe rod workpieces and drive the workpieces to rotate. Two symmetrically arranged clamping arm structures are arranged on the platform between the two concave rotating supports. The clamping arm structures are used to clamp the workpieces radially from the horizontal direction. A partition is fixedly installed below the platform. A connecting rod push-pull mechanism is arranged in the middle of the partition. The power output end of the connecting rod push-pull mechanism is connected to the clamping arm structures on the left and right sides respectively. The left and right outer walls of the platform are equipped with a flip-type radial pressing structure. The flip-type radial pressing structure is connected to the corresponding clamping arm structure through a hinge. The upper end of the flip-type radial pressing structure is equipped with a pressure arm mechanism. The linkage push-pull mechanism is used to drive the left and right clamping arm structures to move towards each other or away from each other. The clamping arm structure drives the flip-type radial pressing structure to flip around the hinge point through the hinge, and then the pressure arm mechanism performs the pressing operation from the outer edge of the workpiece.

[0007] The following are further optimizations of the above technical solution by the present invention: The clamping arm structure includes a T-shaped bottom arm that is slidably mounted on the bottom surface of the partition via a linear track. Both the front and rear ends of the T-shaped bottom arm are integrally formed with bent portions. The two bent portions are symmetrically arranged. The upper end of the bent portion is integrally formed with an end head. An inclined surface is provided on the outer wall of the side of the end head facing the concave self-rotating bracket. A ball bearing is inlaid and rotatably mounted on the inclined surface.

[0008] Further optimization: The hinge includes an outer U-shaped seat bolted to the side of the T-shaped bottom arm away from the bend, a short connecting rod hinged inside the outer U-shaped seat, an inner U-shaped seat mounted on the flip-type radial pressing structure, and the other end of the inner U-shaped seat and the short connecting rod hinged together, which is used to convert the horizontal linear motion of the T-shaped bottom arm into the flipping motion of the flip-type radial pressing structure.

[0009] Further optimization: The flip-type radial pressing structure includes a side plate fixed to the outer wall of one side of the platform. End plates are bolted to both sides of the side plate. The ends of the two end plates away from the side plate are connected to a frame through a hinge shaft. The inner U-shaped seat is fixedly installed at the lower side of the frame.

[0010] Further optimization: The pressure arm mechanism includes a cylinder, a pressure block, and a second ball bearing. The cylinder is vertically installed on one side of the outer wall of the stand. The pressure block is fixedly installed on the upper end of the piston rod of the cylinder. A V-shaped groove is provided on the outer wall of the pressure block facing the concave self-rotating bracket, and the second ball bearing is embedded and rotatably installed in the V-shaped groove. A notch is provided at the middle section of the pressure block and the side plate.

[0011] Further optimization: The linkage push-pull mechanism includes a reduction motor fixedly installed on the top of the platform. A rotating plate is fixedly installed on the lower end of the output shaft of the reduction motor. A fisheye connecting rod is hinged to both ends of the rotating plate. An L-shaped joint is bolted to one side of the outer wall of the T-shaped bottom arm. The upper end of the L-shaped joint is hinged to the other end of the fisheye connecting rod.

[0012] Further optimization: The concave self-rotating support includes a support fixed to the top of the platform, rollers are rotatably mounted on the inner walls of the left and right slopes of the support, a servo motor is mounted on the outer wall of one side of the support, and a belt drive pair for maintaining the transmission connection is installed between the output shaft of the servo motor and one of the rollers.

[0013] Further optimization: The belt drive pair includes a driving pulley mounted on the output shaft of the servo motor and a driven pulley mounted on the corresponding end of the roller shaft. A belt is fitted between the driven pulley and the driving pulley, and the diameter of the driven pulley is smaller than the diameter of the roller shaft.

[0014] Further optimization: The T-shaped bottom arm and pressure block are both made of aluminum alloy.

[0015] The present invention also provides a welding positioning method for processing steel pipe poles, using the above-mentioned welding positioning equipment for processing steel pipe poles, comprising the following steps: S1: The four steel pipe rods to be welded are paired up and hoisted in sequence according to the process order and placed stably into the concave self-rotating brackets on the left and right sides of the top of the platform. The staff needs to manually adjust the axial position of the workpieces to ensure that the mating ends of each pair of workpieces are aligned and the weld gap is adjusted to the range of process requirements. At the same time, the staff visually inspects whether the workpieces are stably placed in the brackets and whether there is any obvious tilting or suspension. S2: The linkage push-pull mechanism drives the clamping arm structures on both sides to move synchronously toward the corresponding concave self-rotating bracket and gradually approach the outer wall of the workpiece to achieve double-sided radial clamping. At the same time, the clamping arm structure is connected to the two left and right flip-type radial pressing structures through hinges. As the clamping arm structure moves, the hinges transmit the moving force to the flip-type radial pressing structure, driving it to flip down synchronously, causing the pressing arm mechanism to flip down and press vertically onto the outer edge of the two sets of steel pipe rod workpieces with a preset pressing force. S3: After confirming that the clamping is in place on both sides and that the pressure arm mechanism has firmly pressed the workpiece, the staff will then perform spot welding on the weld to initially fix the joint of the two steel pipe poles. After spot welding is completed, the concave self-rotating support is turned on, which drives the spot-welded workpiece to rotate synchronously and uniformly at the set welding speed. The staff starts the welding machine and adjusts the welding parameters. As the workpiece rotates, the welding torch continuously welds along the circumferential weld trajectory until the entire circumferential weld is completed. S4: Turn off the welding machine and stop the rotation of the concave self-rotating support. After the weld has cooled to room temperature naturally, reverse the action of the linkage push-pull mechanism again to drive the clamping arm structure to retract inward synchronously. At the same time, drive the tilting radial pressing structure to flip upward and reset through the hinge, so that the pressure arm mechanism is completely separated from the workpiece surface and makes room above. Remove the welded pair of steel pipe rods from the concave self-rotating support.

[0016] The present invention, by adopting the above technical solution, has at least the following beneficial effects: 1. This invention introduces a single linkage push-pull mechanism as the active power source, simultaneously driving the synchronous movement of the left and right clamping arm structures and the sequential downward pressing of the tilting radial pressing structure. This reduces the number of core actuators, lowers the manufacturing cost and floor space of the tooling. Furthermore, since the radial clamping and vertical pressing actions on both sides are rigidly transmitted by the same linkage mechanism along a preset trajectory, the positioning process of the two pairs of workpieces achieves mechanical synchronization and balanced force, effectively avoiding the mutual interference problems caused by independent adjustment at a single station. This ensures the consistency of the positioning state before welding the circumferential seam at both stations. At the same time, the complex operation that originally required the operator to monitor four radial pressing points, two sets of lifting units, and two weld gaps simultaneously is simplified to the action of a single push-pull mechanism, making it convenient for personnel to operate and use.

[0017] 2. In this invention, after the clamping arm structure and the flipping radial pressing structure have completed the positioning and clamping, they do not prevent the concave self-rotating bracket from driving the workpiece to rotate at a uniform speed. Spot welding and subsequent continuous circumferential welding can be seamlessly connected in the same station and in the same clamping state, without the need for secondary hoisting or repositioning. This ensures that the gap at the root of the weld is not disturbed during the entire welding process, and also saves the time cost and repeated positioning error of the workpiece moving between different stations. Attached Figure Description

[0018] Figure 1 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 1 ; Figure 2 This is a three-dimensional sectional view of the overall structure in an embodiment of the present invention; Figure 3 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 2 ; Figure 4 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 3 ; Figure 5 This is an assembly diagram of the folding radial pressing structure and the hinge in an embodiment of the present invention; Figure 6 This is a schematic diagram of the clamping arm structure in an embodiment of the present invention; Figure 7 This is a front view of the overall structure in an embodiment of the present invention; Figure 8 The three-dimensional representation of the overall structure in the embodiments of the present invention Figure 4 ; Figure 9 for Figure 8 A magnified view of a portion of point A in the middle.

[0019] In the diagram: 1-Platform; 2-Concave self-rotating support; 21-Support; 22-Roller; 23-Servo motor; 24-Belt drive pair; 3-Partition; 4-Linkage push-pull mechanism; 41-Gear motor; 42-Rotating plate; 43-Fisheye connecting rod; 44-L-shaped section seat; 5-Clamping arm structure; 51-T-shaped bottom arm; 52-Bending part; 53-End; 54-Beveled part; 55-Ball bearing one; 6-Flipping radial pressing structure; 61-Side plate; 62-End plate; 63-Upright frame; 7-Hinge; 71-Outer U-shaped seat; 72-Short connecting rod; 73-Inner U-shaped seat; 8-Pressure arm mechanism; 81-Cylinder; 82-Pressure block; 83-V-groove; 84-Ball bearing two. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Depend on Figures 1 to 3As shown, a welding positioning device for processing steel pipe rods includes a platform 1. Concave rotating supports 2 are respectively arranged on the left and right sides of the top of the platform 1. The concave rotating supports 2 are used to support paired steel pipe rod workpieces and drive the workpieces to rotate. Two symmetrically arranged clamping arm structures 5 are arranged on the platform 1 between the two concave rotating supports 2. The clamping arm structures 5 are used to clamp the workpieces radially from the horizontal direction. A partition 3 is fixedly installed below the platform 1. A connecting rod push-pull mechanism 4 is arranged in the middle of the partition 3. The power output end of the connecting rod push-pull mechanism 4 is connected to the clamping arm structures 5 on the left and right sides respectively.

[0022] The left and right outer walls of the platform 1 are equipped with a flip-type radial pressing structure 6. The flip-type radial pressing structure 6 is connected to the corresponding clamping arm structure 5 through a hinge 7. The upper end of the flip-type radial pressing structure 6 is provided with a pressure arm mechanism 8. The connecting rod push-pull mechanism 4 is used to drive the left and right clamping arm structures 5 to move towards each other or away from each other. The clamping arm structure 5 drives the flip-type radial pressing structure 6 to flip around the hinge point through the hinge 7, and then the pressure arm mechanism 8 performs the pressing operation from the outer edge of the workpiece.

[0023] In this embodiment, the device requires an external control box. The control box is used to control the welding positioning equipment to perform automated work. The overall structure of the control box consists of a metal cabinet, a touch screen, a button panel, a programmable logic controller, a pressure relay, an electromagnetic reversing valve group, and a power module. It integrates the control valve group, motor start / stop, and signal feedback to realize the single-point issuance of operation commands.

[0024] Example 2, based on Example 1, is... Figure 4 , Figure 5 and Figure 6 As shown, the clamping arm structure 5 includes a T-shaped bottom arm 51 that is slidably mounted on the bottom surface of the partition 3 via a linear track. Both the front and rear ends of the T-shaped bottom arm 51 are integrally formed with bent portions 52. The two bent portions 52 are symmetrically arranged. The upper end of the bent portion 52 is integrally formed with an end head 53. An inclined surface 54 is provided on the outer wall of the side of the end head 53 facing the concave self-rotating support 2. A ball bearing 55 is inlaid and rotatably mounted on the inclined surface 54.

[0025] When the workpiece positioning action is performed, the linkage push-pull mechanism 4 drives the two T-shaped bottom arms 51 to move away from each other, so that the bent part 52, the end 53 and the ball 55 gradually approach the outer wall of the workpiece on the corresponding side, until the ball 55 abuts against the workpiece. The V-shaped inclined surface where the inclined part 54 is located generates an automatic centering effect, forcibly pushing the horizontal position of the steel pipe rod to the preset position of the center plane of the concave self-rotating bracket 2, thereby achieving horizontal radial positioning.

[0026] In this embodiment, the linear track includes a track and a slider. The track is fixedly installed on the bottom surface of the partition 3. The track is laid out perpendicular to the axis of the workpiece. The slider is slidably connected to the track and is fixedly installed on the T-shaped bottom arm 51.

[0027] The hinge 7 includes an outer U-shaped seat 71 bolted to the side of the T-shaped bottom arm 51 away from the bend 52. A short connecting rod 72 is hinged inside the outer U-shaped seat 71. An inner U-shaped seat 73 is installed on the flip-type radial pressing structure 6. The other end of the inner U-shaped seat 73 and the short connecting rod 72 are hinged together to convert the horizontal linear motion of the T-shaped bottom arm 51 into the flipping motion of the flip-type radial pressing structure 6.

[0028] With this design, when the T-shaped bottom arm 51 moves toward the concave self-rotating support 2 on the corresponding side, the T-shaped bottom arm 51 will force the flipping radial pressing structure 6 to flip and press down through the outer U-shaped seat 71, short connecting rod 72 and inner U-shaped seat 73. In this way, by utilizing the lever principle and swing trajectory, the pressing arm mechanism 8 can be fully flipped up when not in operation, without affecting the loading and unloading of the workpiece; and when in operation, it can press down on the upper contour of the workpiece without hindering the rotation of the workpiece.

[0029] The flip-type radial pressing structure 6 includes a side plate 61 fixed on the outer wall of one side of the platform 1. Both sides of the side plate 61 are bolted with end plates 62. The ends of the two end plates 62 away from the side plate 61 are connected to a frame 63 through a hinge shaft. The inner U-shaped seat 73 is fixedly installed at the lower side of the frame 63.

[0030] With this design, when the T-shaped bottom arm 51 is pushed out, the hinge 7 is used to make the upright 63 deflect around the hinge axis in the end plate 62 as the center, and then the pressure arm mechanism 8 swings downward to contact the upper contour of the workpiece. After pressing, since the upright 63 is in the dead zone position slightly past the vertical line, as long as the workpiece does not generate a huge upward force, the pressure arm mechanism 8 can maintain the pressing state.

[0031] The pressure arm mechanism 8 includes a cylinder 81, a pressure block 82, and a second ball bearing 84. The cylinder 81 is arranged vertically and installed on one side of the outer wall of the support frame 63. The pressure block 82 is fixedly installed on the upper end of the piston rod of the cylinder 81. The outer wall of the pressure block 82 facing the concave self-rotating support 2 is provided with a V-groove 83, and the second ball bearing 84 is embedded in and rotatably installed in the V-groove 83.

[0032] In this embodiment, the second ball bearing 84 and the first ball bearing 55 can both press to prevent thermal deformation and arching, and do not hinder the workpiece from rotating under the drive of the concave self-rotating support 2.

[0033] In this embodiment, both the pressure block 82 and the side plate 61 are provided with a notch at the middle section. The notch can avoid the welding area and facilitate the welding operation.

[0034] In this embodiment, both the T-shaped bottom arm 51 and the pressure block 82 are made of aluminum alloy, simplifying the overall structure.

[0035] To avoid insufficient downward stroke and to adapt to changes in pipe diameter, the operator can activate cylinder 81, which drives the pressure block 82 to adjust its position so that it can contact the workpiece after flipping and pressing down.

[0036] Example 3, based on Example 2, by Figure 7 , Figure 8 and Figure 9 As shown, the linkage push-pull mechanism 4 includes a reduction motor 41 fixedly installed on the top of the platform 1. A rotating plate 42 is fixedly installed on the lower end of the output shaft of the reduction motor 41. A fisheye connecting rod 43 is hinged to both ends of the rotating plate 42. An L-shaped joint seat 44 is bolted to one side of the outer wall of the T-shaped bottom arm 51. The upper end of the L-shaped joint seat 44 is hinged to the other end of the fisheye connecting rod 43.

[0037] With this design, the rotating plate 42 is driven to rotate by the geared motor 41. During the rotation, the rotating plate 42 forces the L-shaped joint seat 44 and the T-shaped bottom arm 51 to slide horizontally through the fisheye connecting rod 43. At this time, the stroke of the left and right T-shaped bottom arms 51 is completely consistent.

[0038] The concave self-rotating support 2 includes a support 21 fixed to the top of the platform 1. Rollers 22 are rotatably mounted on the inner walls of the left and right slopes of the support 21. A servo motor 23 is mounted on the outer wall of one side of the support 21. A belt drive pair 24 for maintaining the transmission connection is installed between the output shaft of the servo motor 23 and one of the rollers 22.

[0039] This design allows the concave self-rotating support 2 to support the workpiece and adapt to changes in pipe diameter. As an active rotation drive source, it ensures that the workpiece can still rotate smoothly around its own axis even when pressed by the pressure arm mechanism 8. This integrates spot welding and continuous circumferential welding into the same workstation, avoiding the cumulative errors caused by secondary hoisting.

[0040] The belt drive pair 24 includes a drive pulley mounted on the output shaft of the servo motor 23 and a driven pulley mounted on the corresponding end of the roller shaft 22. A belt is fitted between the driven pulley and the drive pulley, and the diameter of the driven pulley is smaller than the diameter of the roller shaft 22.

[0041] The steel pipe rod is placed on two rollers 22 of the support 21. The servo motor 23 drives one of the rollers 22 to rotate through the belt drive pair 24. Relying on the static friction between the roller 22 and the outer wall of the steel pipe, the workpiece rotates smoothly. The two servo motors 23 can achieve the same speed on both sides by adjusting the frequency converter.

[0042] The present invention also provides a welding positioning method for processing steel pipe poles, using the above-mentioned welding positioning equipment for processing steel pipe poles, comprising the following steps: S1: The four steel pipe rods to be welded are paired up and hoisted in sequence according to the process order and placed stably into the concave self-rotating brackets 2 on the left and right sides of the top of the platform 1. The staff needs to manually adjust the axial position of the workpieces to ensure that the mating ends of each pair of workpieces are aligned and adjust the weld gap to the range of process requirements. At the same time, visually check whether the workpieces are stably placed in the brackets and whether there is any obvious tilting or suspension.

[0043] S2: The linkage push-pull mechanism 4 drives the left and right clamping arm structures 5 to move synchronously toward the corresponding concave self-rotating support 2 and gradually approach the outer wall of the workpiece to achieve double-sided radial clamping. At the same time, the clamping arm structure 5 is connected to the left and right two flip-type radial pressing structures 6 through the hinge 7. As the clamping arm structure 5 moves, the hinge 7 transmits the moving force to the flip-type radial pressing structure 6, driving it to flip down synchronously, causing the pressure arm mechanism 8 to flip down and press vertically onto the outer edge of the two sets of steel pipe rod workpieces with the preset clamping force.

[0044] In step S2, the working principle of the linkage push-pull mechanism 4, the clamping arm structure 5, the hinge 7, and the flipping radial pressing structure 6 is as follows: The reduction motor 41 in the linkage push-pull mechanism 4 drives the rotating plate 42 to rotate. During the rotation, the rotating plate 42 forces the L-shaped joint seat 44 and the T-shaped bottom arm 51 to slide horizontally through the fish-eye connecting rod 43. At this time, the left and right T-shaped bottom arms 51 move away from each other, so that the bent part 52, the end 53, and the ball 55 gradually approach the outer wall of the workpiece on the corresponding side until the ball 55 abuts against the workpiece. The V-shaped inclined surface where the inclined part 54 is located generates an automatic centering effect, which forcibly pushes the horizontal position of the steel pipe rod to the preset position of the center plane of the concave self-rotating bracket 2, thereby achieving horizontal radial positioning.

[0045] When the T-shaped bottom arm 51 moves toward the concave self-rotating support 2 on the corresponding side, the T-shaped bottom arm 51 will force the flipping radial pressing structure 6 to flip and press down through the outer U-shaped seat 71, short connecting rod 72 and inner U-shaped seat 73. In this way, by using the lever principle and swing trajectory, the pressing arm mechanism 8 can be fully flipped up when not in operation, without affecting the loading and unloading of the workpiece; and when in operation, it can press down on the upper contour of the workpiece without hindering the rotation of the workpiece.

[0046] S3: After confirming that the clamping is in place on both sides and that the pressure arm mechanism 8 has firmly pressed the workpiece, the staff will then perform spot welding on the weld seam to initially fix the joint of the two steel pipe rods. After spot welding is completed, the concave self-rotating support 2 is turned on, which drives the spot-welded workpiece to rotate synchronously and uniformly at the set welding speed. The staff starts the welding machine and adjusts the welding parameters. As the workpiece rotates, the welding gun continuously welds along the circumferential seam trajectory until the entire circumferential seam is welded.

[0047] In step S3, the working principle of the concave self-rotating support 2 is as follows: the servo motor 23 starts according to the set program and drives one of the roller shafts 22 to rotate through the belt drive pair 24. Relying on the static friction between the roller shaft 22 and the outer wall of the steel pipe, the workpiece is driven to rotate smoothly, ensuring that the workpiece can rotate smoothly on its own axis under the pressure of the pressure arm mechanism 8, thereby integrating spot welding and continuous ring welding on the same station.

[0048] S4: Turn off the welding machine and stop the rotation of the concave self-rotating support 2. After the weld has cooled to room temperature naturally, reverse the action of the linkage push-pull mechanism 4 again to drive the clamping arm structure 5 to retract inward synchronously. At the same time, drive the flipping radial pressing structure 6 to flip upward and reset through the hinge 7, so that the pressure arm mechanism 8 completely separates from the workpiece surface and makes room above, and remove the welded pair of steel pipe rods from the concave self-rotating support 2.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding positioning device for processing steel pipe poles, characterized in that: The platform includes a platform (1), and concave self-rotating brackets (2) are respectively set at the left and right sides of the top of the platform (1). The concave self-rotating brackets (2) are used to support the steel pipe rods placed in pairs and drive the workpieces to rotate. Two symmetrically arranged clamping arm structures (5) are set at the position between the two concave self-rotating brackets (2) on the platform (1). The clamping arm structures (5) are used to clamp the workpieces radially from the horizontal direction. A partition (3) is fixedly installed below the platform (1). A connecting rod push-pull mechanism (4) is set in the middle of the partition (3). The power output end of the connecting rod push-pull mechanism (4) is connected to the clamping arm structures (5) on the left and right sides respectively. The left and right outer walls of the platform (1) are equipped with a flip-type radial pressing structure (6). The flip-type radial pressing structure (6) and the corresponding clamping arm structure (5) are connected by a hinge (7). The upper end of the flip-type radial pressing structure (6) is provided with a pressure arm mechanism (8). The linkage push-pull mechanism (4) is used to drive the left and right clamping arm structures (5) to move towards each other or away from each other. The clamping arm structure (5) drives the flip-type radial pressing structure (6) to flip around the hinge point through the hinge (7), and then the pressure arm mechanism (8) performs a pressing operation from the outer edge of the workpiece.

2. The welding positioning equipment for processing steel pipe poles according to claim 1, characterized in that: The clamping arm structure (5) includes a T-shaped bottom arm (51) that is slidably installed on the bottom surface of the partition (3) via a straight track. The front and rear ends of the T-shaped bottom arm (51) are integrally formed with bent parts (52). The two bent parts (52) are symmetrically arranged. The upper end of the bent part (52) is integrally formed with an end head (53). The outer wall of the end head (53) facing the concave self-rotating bracket (2) is provided with a beveled part (54). A ball bearing (55) is inlaid and rotatably installed on the beveled part (54).

3. The welding positioning equipment for processing steel pipe poles according to claim 2, characterized in that: The hinge (7) includes an outer U-shaped seat (71) bolted to the side of the T-shaped bottom arm (51) away from the bend (52), a short connecting rod (72) is hinged inside the outer U-shaped seat (71), and an inner U-shaped seat (73) is installed on the flip-type radial pressing structure (6). The other end of the inner U-shaped seat (73) and the short connecting rod (72) are hinged together to convert the horizontal linear motion of the T-shaped bottom arm (51) into the flipping motion of the flip-type radial pressing structure (6).

4. The welding positioning equipment for processing steel pipe poles according to claim 3, characterized in that: The flip-type radial pressing structure (6) includes a side plate (61) fixed on the outer wall of one side of the platform (1). Both sides of the side plate (61) are bolted with end plates (62). The ends of the two end plates (62) away from the side plate (61) are connected to a frame (63) through a hinge shaft. The inner U-shaped seat (73) is fixedly installed on the lower side of the frame (63).

5. The welding positioning equipment for processing steel pipe poles according to claim 4, characterized in that: The pressure arm mechanism (8) includes a cylinder (81), a pressure block (82), and a second ball bearing (84). The cylinder (81) is vertically installed on the outer wall of one side of the stand (63). The pressure block (82) is fixedly installed on the upper end of the piston rod of the cylinder (81). A V-groove (83) is provided on the outer wall of the pressure block (82) facing the concave self-rotating bracket (2), and the second ball bearing (84) is embedded and rotatably installed in the V-groove (83). A notch is provided at the middle section of the pressure block (82) and the side plate (61).

6. The welding positioning equipment for processing steel pipe poles according to claim 5, characterized in that: The linkage push-pull mechanism (4) includes a geared motor (41) fixedly installed on the top of the platform (1). A rotating plate (42) is fixedly installed on the lower end of the output shaft of the geared motor (41). A fisheye connecting rod (43) is hinged to both ends of the rotating plate (42). An L-shaped joint seat (44) is bolted to one side of the outer wall of the T-shaped bottom arm (51). The upper end of the L-shaped joint seat (44) is hinged to the other end of the fisheye connecting rod (43).

7. The welding positioning equipment for processing steel pipe poles according to claim 6, characterized in that: The concave self-rotating support (2) includes a support (21) fixed to the top of the platform (1), rollers (22) are rotatably installed on the inner walls of the left and right slopes of the support (21), a servo motor (23) is installed on the outer wall of one side of the support (21), and a belt drive pair (24) for maintaining the transmission connection is installed between the output shaft of the servo motor (23) and one of the rollers (22).

8. The welding positioning equipment for processing steel pipe poles according to claim 7, characterized in that: The belt drive pair (24) includes a drive pulley mounted on the output shaft of the servo motor (23) and a driven pulley mounted on the end of the corresponding roller shaft (22). A belt is fitted between the driven pulley and the drive pulley. The diameter of the driven pulley is smaller than the diameter of the roller shaft (22).

9. The welding positioning equipment for processing steel pipe poles according to claim 8, characterized in that: The T-shaped bottom arm (51) and the pressure block (82) are both made of aluminum alloy.

10. A welding positioning method for processing steel pipe poles, using the welding positioning equipment for processing steel pipe poles as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: The four steel pipe rods to be welded are paired up and hoisted in sequence according to the process order and placed stably into the concave self-rotating brackets (2) on the left and right sides of the top of the platform (1). The staff needs to manually adjust the axial position of the workpieces to ensure that the mating ends of each pair of workpieces are aligned and adjust the weld gap to the range of process requirements. At the same time, visually check whether the workpieces are stably placed in the brackets and whether there is any obvious tilting or suspension. S2: The linkage push-pull mechanism (4) drives the clamping arm structure (5) on the left and right sides to move synchronously toward the corresponding concave self-rotating bracket (2) and gradually approach the outer wall of the workpiece to achieve double-sided radial clamping. At the same time, the clamping arm structure (5) is connected to the two left and right flip-type radial pressing structures (6) through the hinge (7). As the clamping arm structure (5) moves, the hinge (7) transmits the moving force to the flip-type radial pressing structure (6), driving it to flip down synchronously, and driving the pressure arm mechanism (8) to flip down and press vertically onto the outer edge of the two sets of steel pipe rod workpieces with the preset pressing force. S3: After confirming that the clamping is in place on both sides and that the pressure arm mechanism (8) has firmly pressed the workpiece, the staff immediately performs spot welding on the weld seam to initially fix the joint of the two steel pipe rods; after spot welding is completed, the concave self-rotating bracket (2) is turned on, which drives the spot-welded and fixed workpiece to rotate synchronously and uniformly at the set welding speed. The staff starts the welding machine and adjusts the welding parameters. As the workpiece rotates, the welding gun continuously welds along the circumferential seam trajectory until the entire circumferential seam is welded. S4: Turn off the welding machine and stop the rotation of the concave self-rotating support (2). After the weld has cooled to room temperature, reverse the action of the linkage push-pull mechanism (4) to drive the clamping arm structure (5) to retract inward synchronously. At the same time, drive the flipping radial pressing structure (6) to flip upward and reset through the hinge (7), so that the pressure arm mechanism (8) completely separates from the workpiece surface and makes room above. Take out the welded pair of steel pipe rods from the concave self-rotating support (2).

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