Welding positioning device and positioning method for iron tower welding

Abstract

The invention relates to the technical field of welding equipment, and discloses a welding positioning device and a positioning method for iron tower welding, the welding positioning device comprises a positioner, a welding arm and a clamping arm, a supporting arm is arranged on the positioner, and a machining fluted disc is arranged on the supporting arm; a positioning mechanism is arranged on the machining fluted disc, the positioning mechanism comprises a positioning electric push rod, a plurality of positioning pieces and a locking piece, a switching mechanism is further arranged on the supporting arm, and the switching mechanism comprises a switching electric push rod and a switching assembly. In addition, the shutdown time of the welding arm can be shortened, other to-be-welded bottom feet are still in a fixed state while positioning and fixing of the welded bottom feet are relieved through the positioning piece, so that the use convenience is further improved, the welding arm can continue to work when the clamping arm conducts feeding and discharging, and the welding efficiency is improved. And therefore, the welding efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding positioning device and a positioning method for welding iron towers. Background Technology

[0002] The base of a steel tower is a crucial part of the tower structure. It is usually made of steel plates and is the most common welded component of a steel tower. It is used to support the tower and ensure its stability. Currently, the welding of the base of a steel tower is automated by using welding robots in conjunction with positioners to perform pre-tack welding on the base. At present, the welding process of the base of a steel tower has been largely automated.

[0003] Chinese patent CN120362873A discloses a displacement welding platform for iron tower welding parts. By designing an automatic positioning and clamping mechanism and a follow-up pre-adjustment mechanism, the welding platform can automatically complete the positioning calibration and stable clamping and fixing of the welding parts, which saves manpower and material resources, and also ensures the subsequent welding accuracy and welding quality. However, the above technical solution has some shortcomings in use. For example, without a second positioner, after welding one foot, the user needs to first release the fixing of the welded foot, then use the lifting arm to remove the welded foot from the positioner, and then use the lifting arm to hoist the foot to be welded back onto the positioner. Only after the foot to be processed is positioned and fixed again can the welding operation be performed again. This method greatly increases the number of steps when switching feet, thus affecting the batch processing of feet. Furthermore, due to its cumbersome steps, the welding arm is down for a long time, which further reduces the efficiency of batch welding feet. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a welding positioning device and a positioning method for welding iron towers, which solves the above-mentioned problems.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a welding positioning device, including a positioner, a welding arm and a clamping arm, wherein a support arm is provided on the positioner and a machining toothed disc is provided on the support arm; The machining gear plate is provided with a positioning mechanism, which includes a positioning electric push rod, several positioning components and a locking component. The positioning components are circumferentially distributed on the machining gear plate. During welding, the positioning electric push rod can drive the positioning components to position and fix the workpiece, and the locking component is used to drive the positioning components to release the positioning of the workpiece. The support arm is also provided with a switching mechanism, which includes a switching electric push rod and a switching assembly. The output shaft of the switching electric push rod is provided with a rack, which is used to drive the switching assembly and the locking member to operate. The switching assembly is used to drive the processing gear plate to rotate. During the switching phase, the switching electric push rod can drive the switching assembly to operate through the rack. At this time, the processing gear plate rotates, so that the workpiece under the welding arm can move to the under the clamping arm. During this period, the positioning element maintains the positioning and fixation of the workpiece. During the unloading stage, the switching electric push rod drives the rack to separate from the switching assembly. At this time, the processing gear plate stops rotating. Subsequently, the rack drives the locking member to operate. Then, the locking member can drive the positioning member to release the positioning and fixing of the welded workpiece. After that, the clamping arm unloads the welded workpiece.

[0006] Preferably, a bracket is fixedly connected to the bottom of the machining gear disk. The end of the bracket away from the machining gear disk is rotatably connected to the support arm via a bearing seat. A positioning electric push rod is installed on the inner side of the support arm. The output shaft of the positioning electric push rod passes through the support arm and is rotatably connected to a drive plate. The drive plate is slidably connected to the bracket. Several crossbars are arranged circumferentially on the drive plate. A support rod is hinged to the upper part of the crossbar. A hinge seat is hinged to the end of the support rod away from the crossbar.

[0007] Preferably, the locking component includes several circumferentially distributed bases, the bases are fixedly connected to the hinge seat, the inner side of the bases is fixedly connected to a fixing bolt, the fixing bolt is slidably connected to a slider, the inner side of the slider is threaded with a lead screw, both ends of the lead screw are rotatably connected to the base through bearing seats, and both ends of the lead screw extend out of the base.

[0008] Preferably, a worm gear is fixedly connected to one end of the lead screw, a worm is meshed on the outer side of the worm gear, the worm is rotatably connected to the base, a locking gear is fixedly connected to one end of the worm, and when the rack moves, it can mesh with the locking gear and drive the locking gear to rotate. Symmetrically distributed limiting frames are slidably connected to the base, and the limiting frames are fixedly connected to the bottom surface of the machining gear plate.

[0009] Preferably, the positioning component includes a limiting hole circumferentially formed on the machining gear disk and a positioning plate circumferentially distributed. The positioning plate is fixedly connected to the machining gear disk. A limiting bolt is fixedly connected to the inner side of the limiting hole. A clamping plate is slidably connected to the limiting bolt. The clamping plate corresponds to the positioning plate and is fixedly connected to the slider. A return spring is fixedly connected to one side of the clamping plate, and the end of the return spring away from the clamping plate is fixedly connected to the inner side of the limiting hole.

[0010] Preferably, the clamping plate is threaded with connecting rods on both sides, and a short hinge rod is hinged to the end of the connecting rod away from the clamping plate. A side clamping plate is hinged to the end of the short hinge rod away from the connecting rod, and a long hinge rod is hinged to the side of the side clamping plate away from the short hinge rod. A positioning pin is hinged to the end of the long hinge rod away from the side clamping plate, and the positioning pin is fixedly connected to the machining gear plate.

[0011] Preferably, a mounting plate is fixedly connected to the outer side of the switching electric push rod, the mounting plate is mounted on the support arm, the output shaft of the switching electric push rod passes through the mounting plate and is fixedly connected to an adjustment plate, the adjustment plate has a plurality of arrayed mounting holes, and the rack is mounted on the adjustment plate.

[0012] Preferably, the switching assembly includes a switching gear that meshes with the processing gear disc. A long rotating shaft is fixedly connected to the inner side of the switching gear. The long rotating shaft is rotatably connected to the support arm via a bearing seat. A driven wheel is fixedly connected to the long rotating shaft. A transmission belt is drivenly connected to the inner side of the driven wheel. A driving wheel is drivenly connected to the side of the transmission belt away from the driven wheel. A short rotating shaft is fixedly connected to the inner side of the driving wheel. The short rotating shaft is rotatably connected to the support arm via a bearing seat.

[0013] Preferably, a ratchet structure is fixedly connected to the short rotating shaft, and a one-way gear is provided on the outer side of the ratchet structure. When the rack moves, it can mesh with the one-way gear and drive the one-way gear to rotate.

[0014] A positioning method for welding iron towers, using the aforementioned welding positioning device, includes the following steps:

[0015] S1. The foot is placed on the machining gear plate by the clamping arm, and then the positioning component is driven by the positioning electric push rod to position and fix the foot. S2. The welding arm welds the base. S3. Switch the electric push rod to drive the switching component to operate, thereby driving the machining gear plate to rotate, thus realizing the switching of the base feet; S4. Switch the electric push rod and rack drive the locking mechanism to release the fixing of the welded base. The clamping arm removes the base from the processing gear plate and places the new base in the empty position. Then switch the electric push rod to reset to achieve the positioning and fixing of the new base.

[0016] Compared with the prior art, the present invention provides a welding positioning device and a positioning method for welding iron towers, which have the following beneficial effects: 1. In this invention, before welding, the circumference of the tower base to be welded is placed on the processing gear plate of the support arm by the clamping arm. Then, the positioning electric push rod drives the positioning component to rotate, thereby positioning and fixing multiple bases. Then, the welding arm welds the bases on the processing gear plate. After welding one base, the switching electric push rod is driven to rotate. The switching electric push rod drives the rack to move towards the switching component. Then, the rack drives the switching component to rotate. The switching component drives the processing gear plate to rotate. At this time, the welded base moves away from under the welding arm. At the same time, another base to be welded on the processing gear plate moves to under the welding arm. Then the welding arm can perform welding operation again. This achieves rapid switching of the base position, thereby greatly reducing the welding arm downtime and improving the efficiency of batch welding. At the same time, the positioning component can position and fix multiple bases at one time, thereby greatly improving practicality.

[0017] In this invention, when the switching electric push rod drives the processing gear plate to rotate, the welded base is moved by the processing gear plate to below the clamping arm. At this time, the switching electric push rod drives the rack to continue moving, and the rack separates from the switching component. The processing gear plate stops moving. As the rack moves, it drives the locking component to operate. The operation of the locking component drives the positioning component to release the fixation of the welded base. The clamping arm then removes the welded base from the processing gear plate, and a new base to be welded is placed on the processing gear plate. After that, the switching electric push rod resets. During this process, the rack drives the locking component to reset, and the positioning component fixes the new base to be welded. This allows the positioning component to release the fixation of the welded base without affecting the fixation of other bases to be welded. At the same time, the welding arm can continue to work while the clamping arm is loading and unloading, thereby further improving the welding efficiency. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view schematic diagram of the overall structure of the present invention; Figure 3 This is a first-view schematic diagram of the positioner in this invention; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the positioner from a second perspective in this invention. Figure 6 This is an enlarged schematic diagram of the support arm structure in this invention; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B; Figure 8 This is a side sectional view of the support arm structure in this invention; Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point C; Figure 10 This is a schematic diagram of the ratchet structure in this invention.

[0019] In the picture: 1. Positioner; 2. Welding arm; 3. Clamping arm; 4. Support arm; 41. Machining gear plate; 411. Bracket; 5. Positioning mechanism; 51. Positioning electric actuator; 511. Drive plate; 512. Crossbar; 513. Support rod; 514. Hinge seat; 52. Positioning component; 521. Limiting hole; 522. Positioning plate; 523. Limiting bolt; 524. Clamping plate; 525. Return spring; 526. Connecting rod; 527. Short hinge rod; 528. Side clamping plate; 529. Long hinge rod; 5210. Positioning pin; 53. Locking component; 531. Base; 532. Fixing bolt; 533. Slider; 534. Lead screw; 536. Worm gear; 537. Worm; 538. Locking gear; 539. Limiting bracket; 6. Switching mechanism; 61. Switching electric push rod; 611. Rack; 612. Adjusting plate; 62. Switching component; 621. Switching gear; 622. Long shaft; 623. Driven wheel; 624. Drive belt; 625. Drive wheel; 626. Short shaft; 627. Ratchet structure; 628. One-way gear. 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a welding positioning device and a positioning method for welding iron towers.

[0022] Example 1: Please refer to Figures 1-10 A welding positioning device includes a positioner 1, a welding arm 2 and a clamping arm 3. The positioner 1 is provided with a support arm 4 and the support arm 4 is provided with a processing toothed disc 41. A positioning mechanism 5 is provided on the machining gear plate 41. The positioning mechanism 5 includes a positioning electric push rod 51, several positioning parts 52 and a locking part 53. The positioning parts 52 are circumferentially distributed on the machining gear plate 41. During welding, the positioning electric push rod 51 can drive the positioning parts 52 to position and fix the workpiece. The locking part 53 is used to drive the positioning parts 52 to release the positioning of the workpiece. The support arm 4 is also equipped with a switching mechanism 6, which includes a switching electric push rod 61 and a switching component 62. A rack 611 is provided on the output shaft of the switching electric push rod 61. The rack 611 is used to drive the switching component 62 and the locking component 53 to rotate. The switching component 62 is used to drive the machining gear plate 41 to rotate. During the switching phase, the switching electric push rod 61 can drive the switching assembly 62 to operate through the rack 611. At this time, the processing gear plate 41 rotates, so that the workpiece under the welding arm 2 can move to the clamping arm 3. During this period, the positioning member 52 keeps the workpiece in a fixed position. During the unloading stage, the switching electric push rod 61 drives the rack 611 to separate from the switching component 62. At this time, the processing gear plate 41 stops rotating. Subsequently, the rack 611 drives the locking component 53 to operate. At this time, the locking component 53 can drive the positioning component 52 to release the positioning and fixing of the welded workpiece. After that, the clamping arm 3 unloads the welded workpiece.

[0023] In use, the user places the foot to be welded around the circumference on the processing gear plate 41 using the clamping arm 3. Then, the positioning electric push rod 51 drives the positioning component 52 to rotate, achieving one-click positioning and fixing of multiple feet. Next, the welding arm 2 welds the feet on the processing gear plate 41. After welding one foot, the switching electric push rod 61 is driven to rotate, which in turn drives the rack 611 to move towards the switching component 62. The rack 611 then drives the switching component 62, which in turn drives the processing gear plate 41 to rotate. At this point, the welded foot under the welding arm 2 is moved away from the welding arm 2 and moves under the clamping arm 3. As the welded foot moves, another foot to be welded on the processing gear plate 41 is moved under the welding arm 2. The welding arm 2 can then perform welding operations again. After the welded foot is moved under the clamping arm 3 by the processing gear plate 41, the switching electric push rod 61 drives the rack 611 to continue moving. Separated from the switching component 62, the processing gear plate 41 stops moving. As the rack 611 moves, it drives the locking component 53 to operate. The locking component 53 then drives the positioning component 52 to release the fixing of the welded base. At this time, the clamping arm 3 removes the welded base from the processing gear plate 41 and places the new base to be welded on the processing gear plate 41. Then, the switching electric push rod 61 resets. During this process, the rack 611 drives the locking component 53 to reset, and the positioning component 52 repositions and fixes the new base to be welded. This allows for quick switching of bases, greatly reducing the number of steps required for switching bases and reducing the downtime of the welding arm 2, thereby improving the efficiency of batch welding. While the positioning component 52 releases the fixing of the welded base, other bases to be welded remain fixed, further improving ease of use. While the clamping arm 3 is loading and unloading, the welding arm 2 can continue to work, further improving welding efficiency.

[0024] It should be noted that when the clamping arm 3 is loading and unloading, the welding arm 2 is performing a flat welding operation, that is, the position of the support arm 4 will not change.

[0025] Example 2: See Figures 1-10Unlike Embodiment 1 described above, the bottom of the machining gear disk 41 is fixedly connected to a bracket 411. The end of the bracket 411 away from the machining gear disk 41 is rotatably connected to the support arm 4 via a bearing seat. The positioning electric push rod 51 is installed on the inner side of the support arm 4. The output shaft of the positioning electric push rod 51 passes through the support arm 4 and is rotatably connected to a drive plate 511. The drive plate 511 is slidably connected to the bracket 411. Several crossbars 512 are arranged circumferentially on the drive plate 511. A support rod 513 is hinged to the upper part of the crossbar 512. A hinge seat 514 is hinged to the end of the support rod 513 away from the crossbar 512. The locking member 53 includes several circumferentially distributed... The base 531 is fixedly connected to the hinge seat 514. A fixing bolt 532 is fixedly connected to the inner side of the base 531. A slider 533 is slidably connected to the fixing bolt 532. A lead screw 534 is threadedly connected to the inner side of the slider 533. Both ends of the lead screw 534 are rotatably connected to the base 531 via bearing seats, and both ends of the lead screw 534 extend out of the base 531. A worm gear 536 is fixedly connected to one end of the lead screw 534. A worm 537 meshes with the outer side of the worm gear 536 and is rotatably connected to the base 531. A locking gear 538 and a rack 611 are fixedly connected to one end of the worm 537. When moving, it can mesh with the locking gear 538 and drive the locking gear 538 to rotate. Symmetrically distributed limiting frames 539 are slidably connected to the base 531. The limiting frames 539 are fixedly connected to the bottom surface of the machining gear disk 41. The positioning component 52 includes a limiting hole 521 circumferentially opened on the machining gear disk 41 and circumferentially distributed positioning plates 522. The positioning plates 522 are fixedly connected to the machining gear disk 41. A limiting bolt 523 is fixedly connected to the inner side of the limiting hole 521. A clamping plate 524 is slidably connected to the limiting bolt 523. The clamping plate 524 corresponds to the positioning plate 522 and is fixedly connected to the slider 533. A return spring 525 is fixedly connected to one side of the holding plate 524. The end of the return spring 525 away from the clamping plate 524 is fixedly connected to the inside of the limiting hole 521. The two sides of the clamping plate 524 are threadedly connected to the connecting rod 526. The end of the connecting rod 526 away from the clamping plate 524 is hinged to a short hinge rod 527. The end of the short hinge rod 527 away from the connecting rod 526 is hinged to a side clamping plate 528. The side of the side clamping plate 528 away from the short hinge rod 527 is hinged to a long hinge rod 529. The end of the long hinge rod 529 away from the side clamping plate 528 is hinged to a positioning pin 5210. The positioning pin 5210 is fixedly connected to the machining gear plate 41. In use, the circumference of the base to be welded is placed on the machining gear plate 41 using the clamping arm 3. At this time, one side of the base is in contact with the positioning plate 522. After placement, the positioning electric push rod 51 rotates, which drives the drive plate 511 to move upward along the bracket 411. The upward movement of the drive plate 511 drives the crossbar 512 to move upward. The upward movement of the crossbar 512 drives the support rod 513 to move outward from the drive plate 511. The movement of the support rod 513 drives the hinge seat 514 to move. The movement of the hinge seat 514 drives the base 531 to move along the limit frame 539. The actuator moves the lead screw 534, fixing bolt 532, slider 533, and clamping plate 524 toward the positioning plate 522. The clamping plate 524 moves to compress the return spring 525 and moves the connecting rods 526 on both sides of it. The connecting rods 526 move to move the short hinge rod 527. The short hinge rod 527 moves to move the side clamping plate 528 and the long hinge rod 529 around the positioning pin 5210 in an arc. The side clamping plate 528 moves gradually toward the bottom foot. Then, with the cooperation of the clamping plate 524 and the side clamping plate 528, the effect of positioning and fixing multiple bottom feet with one click is achieved.

[0026] Example 3, see Figures 1-10 Unlike Embodiment 2 described above, a mounting plate is fixedly connected to the outer side of the switching electric push rod 61. The mounting plate is mounted on the support arm 4. The output shaft of the switching electric push rod 61 passes through the mounting plate and is fixedly connected to an adjusting plate 612. The adjusting plate 612 has several arrayed mounting holes. A rack 611 is mounted on the adjusting plate 612. The switching assembly 62 includes a switching gear 621, which meshes with the processing gear disc 41. A long rotating shaft 622 is fixedly connected to the inner side of the switching gear 621. The long rotating shaft 622 is rotatably connected to the support arm 4 through a bearing seat. A driven wheel 623 is fixedly connected to a long rotating shaft 622. A transmission belt 624 is driven to the inner side of the driven wheel 623. A driving wheel 625 is driven to the side of the transmission belt 624 away from the driven wheel 623. A short rotating shaft 626 is fixedly connected to the inner side of the driving wheel 625. The short rotating shaft 626 is rotatably connected to the support arm 4 through a bearing seat. A ratchet structure 627 is fixedly connected to the short rotating shaft 626. A one-way gear 628 is provided on the outer side of the ratchet structure 627. When the rack 611 moves, it can mesh with the one-way gear 628 and drive the one-way gear 628 to rotate. During switching, the switching electric push rod 61 drives the rack 611 to move, the rack 611 drives the one-way gear 628 to rotate, the one-way gear 628 drives the ratchet structure 627 to rotate, the ratchet structure 627 drives the short shaft 626 to rotate, the short shaft 626 drives the drive wheel 625 to rotate, the drive wheel 625 drives the driven wheel 623 to rotate via the transmission belt 624, the driven wheel 623 drives the long shaft 622 to rotate, the long shaft 622 drives the switching gear 621 to rotate, and the switching gear 621 drives the machining gear plate 41 to rotate, thereby realizing the switching of the base. When the switching electric push rod 61 is reset, the ratchet structure 627 can prevent the short shaft 626 from rotating, thereby preventing the switching gear 621 and the machining gear plate 41 from rotating.

[0027] Example 4, see Figures 1-10 Unlike Embodiment 3 described above, the locking member 53 includes several circumferentially distributed bases 531. The bases 531 are fixedly connected to the hinge seat 514. A fixing bolt 532 is fixedly connected to the inner side of each base 531. A slider 533 is slidably connected to the fixing bolt 532. A lead screw 534 is threadedly connected to the inner side of the slider 533. Both ends of the lead screw 534 are rotatably connected to the base 531 via bearing seats, and both ends of the lead screw 534 extend out of the base 531. A worm gear 536 is fixedly connected to one end of the lead screw 534. A worm 537 meshes with the outer side of the worm gear 536 and is rotatably connected to the base. On the base 531, a locking gear 538 is fixedly connected to one end of the worm gear 537. When the rack 611 moves, it can mesh with the locking gear 538 and drive the locking gear 538 to rotate. A symmetrically distributed limit frame 539 is slidably connected on the base 531. The limit frame 539 is fixedly connected to the bottom surface of the machining gear plate 41. A mounting plate is fixedly connected to the outer side of the switching electric push rod 61. The mounting plate is installed on the support arm 4. The output shaft of the switching electric push rod 61 passes through the mounting plate and is fixedly connected to the adjustment plate 612. Several arrayed mounting holes are opened on the adjustment plate 612. The rack 611 is installed on the adjustment plate 612. When it is necessary to unload the welded base, the switching electric push rod 61 drives the rack 611 to continue moving. The rack 611 moves and disengages from the switching assembly 62. Then, the rack 611 meshes with the locking gear 538. As the rack 611 moves, it drives the locking gear 538 to rotate. The rotation of the locking gear 538 drives the worm gear 537 to rotate. The rotation of the worm gear 537 drives the worm wheel 536 to rotate. The rotation of the worm wheel 536 drives the lead screw 534 to rotate. The rotation of the lead screw 534 drives the slider 533 to move along the fixing bolt 532. The movement of the slider 533 drives the clamping plate 524 to move along... The limit bolt 523 resets, the clamping plate 524 resets, and the side clamping plate 528 resets. At this time, the clamping plate 524 and the side clamping plate 528 release the positioning and fixing of the welded foot. Then the clamping arm 3 removes the welded foot from the processing gear plate 41. Then the new foot to be welded is placed in the empty space. Then the electric push rod 61 is switched to reset. At this time, the rack 611 is reset. The rack 611 reset drives the locking gear 538 to rotate in the opposite direction. Similarly, the lead screw 534 drives the clamping plate 524 to reset. At this time, the clamping plate 524 and the side clamping plate 528 can position and fix the new foot to be welded.

[0028] Example 5, see Figures 1-10 Unlike Embodiment 4 above, a positioning method for welding iron towers uses the aforementioned welding positioning device and includes the following steps: S1. The foot is placed on the machining gear plate 41 by the clamping arm 3, and then the positioning electric push rod 51 drives the positioning component 52 to position and fix the foot. S2, Welding arm 2 welds the base; S3. The electric push rod 61 drives the switching assembly 62 to operate, thereby driving the machining gear plate 41 to rotate, thus realizing the switching of the base foot. S4. Switch the electric push rod 61 and the rack 611 to drive the locking part 53 to operate, thereby releasing the fixation of the welded base. The clamping arm 3 removes the base from the processing gear plate 41 and places the new base in the empty position. Then, by switching the electric push rod 61 to reset, the new base is positioned and fixed.

[0029] 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, comprising a positioner, a welding arm, and a clamping arm, characterized in that: The positioner is equipped with a support arm, and the support arm is equipped with a machining gear plate; The machining gear plate is provided with a positioning mechanism, which includes a positioning electric push rod, several positioning components and a locking component. The positioning components are circumferentially distributed on the machining gear plate. During welding, the positioning electric push rod can drive the positioning components to position and fix the workpiece, and the locking component is used to drive the positioning components to release the positioning of the workpiece. The support arm is also provided with a switching mechanism, which includes a switching electric push rod and a switching assembly. The output shaft of the switching electric push rod is provided with a rack, which is used to drive the switching assembly and the locking member to operate. The switching assembly is used to drive the processing gear plate to rotate. During the switching phase, the switching electric push rod can drive the switching assembly to operate through the rack. At this time, the processing gear plate rotates, so that the workpiece under the welding arm can move to the under the clamping arm. During this period, the positioning element maintains the positioning and fixation of the workpiece. During the unloading stage, the switching electric push rod drives the rack to separate from the switching assembly. At this time, the processing gear plate stops rotating. Subsequently, the rack drives the locking member to operate. Then, the locking member can drive the positioning member to release the positioning and fixing of the welded workpiece. After that, the clamping arm unloads the welded workpiece.

2. The welding positioning device according to claim 1, characterized in that: A bracket is fixedly connected to the bottom of the machining gear disk. The end of the bracket away from the machining gear disk is rotatably connected to the support arm via a bearing seat. A positioning electric push rod is installed on the inner side of the support arm. The output shaft of the positioning electric push rod passes through the support arm and is rotatably connected to a drive plate. The drive plate is slidably connected to the bracket. Several crossbars are arranged around the circumference of the drive plate. A support rod is hinged to the upper part of the crossbar. A hinge seat is hinged to the end of the support rod away from the crossbar.

3. The welding positioning device according to claim 2, characterized in that: The locking component includes several circumferentially distributed bases, which are fixedly connected to the hinge seat. A fixing bolt is fixedly connected to the inner side of the base, and a slider is slidably connected to the fixing bolt. A lead screw is threaded to the inner side of the slider, and both ends of the lead screw are rotatably connected to the base through bearing seats, with both ends of the lead screw extending out of the base.

4. A welding positioning device according to claim 3, characterized in that: One end of the lead screw is fixedly connected to a worm gear, and a worm is meshed on the outer side of the worm gear. The worm is rotatably connected to the base, and one end of the worm is fixedly connected to a locking gear. When the rack moves, it can mesh with the locking gear and drive the locking gear to rotate. Symmetrically distributed limit frames are slidably connected to the base, and the limit frames are fixedly connected to the bottom surface of the machining gear plate.

5. A welding positioning device according to claim 4, characterized in that: The positioning component includes a limiting hole circumferentially formed on the machining gear disk and a positioning plate circumferentially distributed. The positioning plate is fixedly connected to the machining gear disk. A limiting bolt is fixedly connected to the inner side of the limiting hole. A clamping plate is slidably connected to the limiting bolt. The clamping plate corresponds to the positioning plate and is fixedly connected to the slider. A return spring is fixedly connected to one side of the clamping plate. The end of the return spring away from the clamping plate is fixedly connected to the inner side of the limiting hole.

6. A welding positioning device according to claim 5, characterized in that: The clamping plate is threaded with connecting rods on both sides. A short hinge rod is hinged to the end of the connecting rod away from the clamping plate. A side clamping plate is hinged to the end of the short hinge rod away from the connecting rod. A long hinge rod is hinged to the side of the side clamping plate away from the short hinge rod. A positioning pin is hinged to the end of the long hinge rod away from the side clamping plate. The positioning pin is fixedly connected to the machining gear plate.

7. A welding positioning device according to claim 1, characterized in that: A mounting plate is fixedly connected to the outer side of the switching electric push rod. The mounting plate is mounted on the support arm. The output shaft of the switching electric push rod passes through the mounting plate and is fixedly connected to an adjustment plate. The adjustment plate has a plurality of arrayed mounting holes. The rack is mounted on the adjustment plate.

8. A welding positioning device according to claim 7, characterized in that: The switching assembly includes a switching gear that meshes with the machining gear disc. A long rotating shaft is fixedly connected to the inner side of the switching gear. The long rotating shaft is rotatably connected to the support arm via a bearing seat. A driven wheel is fixedly connected to the long rotating shaft. A transmission belt is drivenly connected to the inner side of the driven wheel. A driving wheel is drivenly connected to the side of the transmission belt away from the driven wheel. A short rotating shaft is fixedly connected to the inner side of the driving wheel. The short rotating shaft is rotatably connected to the support arm via a bearing seat.

9. A welding positioning device according to claim 8, characterized in that: A ratchet structure is fixedly connected to the short rotating shaft. A one-way gear is provided on the outer side of the ratchet structure. When the rack moves, it can mesh with the one-way gear and drive the one-way gear to rotate.

10. A positioning method for welding iron towers, using the welding positioning device as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. The foot is placed on the machining gear plate by the clamping arm, and then the positioning component is driven by the positioning electric push rod to position and fix the foot. S2. The welding arm welds the base. S3. Switch the electric push rod to drive the switching component to operate, thereby driving the machining gear plate to rotate, thus realizing the switching of the base feet; S4. Switch the electric push rod and rack drive the locking mechanism to release the fixing of the welded base. The clamping arm removes the base from the processing gear plate and places the new base in the empty position. Then switch the electric push rod to reset to achieve the positioning and fixing of the new base.

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