Welding equipment for stadium awning truss structure convenient to position

Abstract

The invention provides a stadium awning truss structure welding device convenient to position. The stadium awning truss structure welding device comprises a welding platform and a welding machine. The welding platform comprises a plurality of welding modules which are detachably connected to form the welding platform; the welding machine is arranged outside the welding platform; the welding module comprises a second positioning module, two first positioning modules and a supporting module. The second positioning module and the supporting module each comprise a supporting table. The first positioning module comprises a clamping mechanism, and the clamping mechanism is used for fixing the vertical position of the truss; the supporting table comprises a supporting base, a top plate and a telescopic structure, the top plate is arranged above the supporting base, and the telescopic structure with the adjustable vertical height is arranged between the top plate and the supporting base; according to the stadium awning truss structure welding device convenient to position, deformation can be automatically detected, meanwhile, reverse force is applied through multi-stage compensation to offset thermal stress, then the deformation is reduced, welding precision is improved, welding positioning is convenient, and welding errors are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly to a welding device for a stadium canopy truss structure that is convenient for positioning. Background Art

[0002] Welding, also known as fusion welding, is a manufacturing process and technology for joining metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. The stadium canopy truss structure is a large-span space steel structure used to support the stadium roof, covering the spectator stands and the competition area. Welding is one of the core processes in the manufacturing and installation of the stadium canopy truss structure, and its application runs through the entire process of design, manufacturing, and construction.

[0003] The stadium canopy truss structure is mostly a complex three-dimensional space structure. At the node intersection, components at multiple angles and in multiple directions need to be accurately aligned, and auxiliary positioning is required during welding.

[0004] During the welding positioning process of the stadium canopy truss structure, due to local high temperature causing thermal expansion of the metal and shrinkage deformation after cooling, the relative positions of adjacent components may be changed, resulting in cumulative errors. However, in the prior art, there is a lack of compensation measures for the positioning deviation caused by welding thermal deformation, thus leading to cumulative errors during the welding process and ultimately resulting in low structural strength of the stadium canopy truss structure at the welding location. Summary of the Invention

[0005] In order to solve the problem of the lack of compensation measures for the positioning deviation caused by welding thermal deformation in the background art, the present invention proposes a welding device for a stadium canopy truss structure that is convenient for positioning.

[0006] The technical solution of the present invention is: It includes a welding platform and a welding machine; The welding platform includes a plurality of welding modules, and the plurality of welding modules are detachably connected to form the welding platform; The welding machine is arranged outside the welding platform; The welding module includes a second positioning module, two first positioning modules, and a support module. Both the second positioning module and the support module include a support table; The first positioning module includes a clamping mechanism, and the clamping mechanism is used to fix the vertical position of the truss; The support table includes a support base, a top plate, and a telescopic structure. The top plate is arranged above the support base, and a vertically height-adjustable telescopic structure is arranged between the top plate and the support base; The telescopic structure includes a primary compensation mechanism and a secondary compensation mechanism. The primary compensation mechanism is arranged on the top of the secondary compensation mechanism. The primary compensation mechanism can be telescoped in the up and down directions. The top of the primary compensation mechanism is fixedly connected to the top plate. A controller is arranged on the support base, and the primary compensation mechanism can be reset to a fixed length under the control of the controller; A vertical chute is provided at the top of the support base. The lower end of the secondary compensation mechanism is slidably inserted into the vertical chute. A strain gauge electrically connected to the controller is provided at the bottom of the vertical chute, and the lower end of the secondary compensation mechanism is fixedly connected to the outer surface of the strain gauge; The secondary compensation mechanism can be telescopically extended and retracted vertically. A driving mechanism controlled by the controller is provided on the secondary compensation mechanism, and the driving mechanism is used to actively drive the secondary compensation mechanism to extend and retract vertically.

[0007] Preferably, the secondary compensation mechanism includes a support plate, a bracket, a support frame, a sliding frame and a plug rod. The support plate is arranged on the upper part of the base. A plug rod is fixedly connected to the bottom of the support plate. The plug rod is slidably connected to the inside of the vertical chute, and the bottom of the plug rod is fixedly connected to the strain gauge; A bracket is provided at the top of the support plate. A chute with an upper opening is provided on the bracket. A sliding frame is slidably connected in the chute. The support frame is arranged above the sliding frame, and the top end of the sliding frame is fixedly connected to the bottom of the support frame; A gap is left between the bottom of the support frame and the support plate to form an installation cavity. The driving mechanism is arranged on the bottom wall of the installation cavity to drive the support frame to move up and down; The primary compensation mechanism is arranged on the top of the support frame.

[0008] Preferably, the driving mechanism includes a lead screw, a first driven gear, a first motor and a first driving gear. The lead screw is vertically rotatably arranged on the top of the support plate. A threaded connection groove with a lower opening is provided on the support frame, and the threaded connection groove is threadedly connected to the lead screw; The first motor is fixedly installed on the top of the support plate. The output end of the first motor is fixedly connected to the first driving gear. A first driven gear is fixedly sleeved on the lower part of the lead screw. The first driven gear is meshed and connected to the first driving gear, and the first motor is controlled and connected to the controller.

[0009] Preferably, the primary compensation mechanism includes an installation groove with an upper opening, a sliding column and an SMA spring. The installation groove is provided on the top of the support frame. A sliding column is fixedly connected to the bottom of the installation groove. A sliding avoidance groove is provided on the top plate. The upper part of the sliding column is slidably connected to the sliding avoidance groove. The SMA spring is movably sleeved on the outer surface of the sliding column. The upper end of the SMA spring is fixedly connected to the bottom of the top plate, and the lower end of the SMA spring is fixedly connected to the bottom wall of the installation groove.

[0010] Preferably, the second positioning module further includes a positioning mechanism, and the positioning mechanism is arranged on the corresponding top plate; The positioning mechanism includes a rotation adjustment mechanism, a slide rail, a sliding base, a rotating shaft and a positioning frame. The slide rail is arranged on the top of the corresponding top plate. The sliding base is slidably connected to the slide rail. A rotating shaft is rotatably arranged on the top of the sliding base. The rotating shaft is vertically arranged. The top of the rotating shaft is fixedly connected to the positioning frame, and a positioning groove is provided on the positioning frame; The sliding base is provided with a locking member for locking the sliding base on the slide rail. The rotation adjustment mechanism is arranged on the top of the sliding base and is used to drive the rotation of the rotating shaft.

[0011] Preferably, the rotation adjustment mechanism includes a rotating support, a worm and a worm wheel. The rotating support is arranged on the top of the sliding base. The worm is rotatably arranged on the rotating support. The worm wheel is fixedly sleeved on the lower part of the rotating shaft. The worm is meshed and connected with the worm wheel.

[0012] Preferably, the locking member includes a threaded locking hole. The sliding base is provided with a jack. A locking bolt is inserted into the jack. The threaded locking holes are arranged at intervals in an array along the extending direction of the slide rail on the top of the corresponding top plate. One end of the locking bolt close to the top plate is internally threaded and connected with the position-corresponding threaded locking hole.

[0013] Preferably, the clamping mechanisms on the two first positioning modules are arranged oppositely. The first positioning module further includes a positioning support platform arranged on the ground. The clamping mechanism is arranged on the top of the positioning support platform. The clamping mechanism includes a height adjustment mechanism, a cylinder and a flipping mechanism. The height adjustment mechanism is arranged on the top of the positioning support platform. The height adjustment mechanism includes a vertical guide rail, an adjustment screw rod and a connecting seat. The vertical guide rail is fixedly connected to the top of the positioning support platform. The adjustment screw rod is rotatably arranged in the vertical guide rail. The adjustment screw rod is arranged vertically. A connecting seat is slidably connected in the vertical guide rail. The connecting seat is threadedly sleeved with the adjustment screw rod. The cylinder is fixedly installed on the connecting seat. The cylinder is arranged perpendicular to the vertical guide rail. The flipping mechanism is arranged on the telescopic end of the cylinder. The telescopic end of the cylinder is fixedly connected with the flipping mechanism.

[0014] Preferably, the flipping mechanism includes a connecting bracket, a flipping rotating shaft, a second driven gear, a second driving motor and a second driving gear. The connecting bracket is fixedly connected to the telescopic end of the cylinder. A working cavity is arranged in the connecting bracket. The flipping rotating shaft is rotatably arranged in the working cavity. The second driven gear is fixedly sleeved on the flipping rotating shaft. The second driving motor is arranged in the working cavity. The output end of the second driving motor is fixedly connected with the second driving gear. The second driving gear is in transmission connection with the second driven gear. One end of the flipping rotating shaft far from the vertical guide rail penetrates through the outer surface of the connecting bracket, and a flipping positioning member is fixedly connected to the end of the flipping rotating shaft far from the vertical guide rail.

[0015] Preferably, the flipping positioning member includes a flipping frame and a limiting frame. The flipping frame is fixedly connected to the end of the flipping rotating shaft far from the vertical guide rail. The turnover rack is a U-shaped opening structure extending in the horizontal direction. There is an installation plane on the turnover rack, and a limiting rack is fixedly connected to the installation plane. The limiting rack is a conical structure.

[0016] Advantages of the present invention: 1. It is possible to detect the increase in the amount of deformation by the change in the output current of the resistance strain gauge under force, and at the same time apply a reverse force through multi-stage compensation to offset the thermal stress, thereby reducing the amount of deformation, improving the welding accuracy, facilitating welding positioning, and eliminating the positioning error caused by thermal stress.

[0017] 2. The welding platform is modularized into a variety of welding modules, which can adapt to different-shaped special-shaped truss structures, and thus meet different welding requirements.

[0018] 3. A positioning mechanism with adjustable position and adjustable rotation angle is provided, which is convenient for auxiliary positioning of truss welding components with different shapes. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the main structure of Embodiment 1; Figure 2 It is a schematic diagram of the structure of the first positioning module of Embodiment 1; Figure 3 It is a schematic diagram of the structure of the turnover mechanism of Embodiment 1; Figure 4 It is a schematic diagram of the structure of the second positioning module of Embodiment 1; Figure 5 It is a schematic diagram of the structure of the positioning mechanism of Embodiment 1; Figure 6 It is a schematic diagram of the main structure of Embodiment 1; Figure 7 It is a schematic diagram of the structure of the support platform of Embodiment 1; Figure 8 It is an enlarged schematic diagram of part A of Embodiment 1; Figure 9 It is an enlarged schematic diagram of part B of Embodiment 1.

[0021] In the figure, 1 is the support platform, 2 is the welding machine, 3 is the positioning mechanism, 301 is the slide rail, 302 is the sliding base, 303 is the rotating shaft, 304 is the positioning frame, 305 is the rotating support, 306 is the worm, 307 is the worm gear, 308 is the threaded locking hole, 4 is the clamping mechanism, 401 is the vertical guide rail, 402 is the adjusting screw rod, 403 is the connecting seat, 404 is the cylinder, 405 is the connecting bracket, 406 is the flipping frame, 407 is the limiting frame, 408 is the flipping rotating shaft, 409 is the second driven gear, 410 is the second driving motor, 411 is the second driving gear, 5 is the installation cavity, 6 is the support plate, 7 is the bracket, 8 is the support frame, 9 is the sliding frame, 10 is the insertion rod, 11 is the resistance strain gauge, 12 is the top plate, 13 is the installation groove, 14 is the sliding column, 15 is the SMA spring, 16 is the threaded connection groove, 17 is the screw rod, 18 is the first driven gear, 19 is the first motor, 20 is the first driving gear. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1: This embodiment aims to propose a welding device for a stadium canopy truss structure that is convenient for positioning.

[0024] According to Figures 1-9 as shown, it includes a welding platform and a welding machine 2.

[0025] The welding platform includes a plurality of welding modules. The plurality of welding modules are detachably connected to form the welding platform. The welding module includes a second positioning module, two first positioning modules arranged oppositely, and a support module. The number and positional relationship of the second positioning module, the first positioning module, and the support module can be adjusted according to welding requirements to adapt to different welding needs.

[0026] The first positioning module includes a clamping mechanism 4 and a positioning support platform. The positioning support platform is arranged on the ground, and the clamping mechanism 4 is arranged on the top of the positioning support platform. The clamping mechanism 4 includes a height adjustment mechanism, a cylinder 404, and a flipping mechanism. The height adjustment mechanism is arranged on the top of the positioning support platform. The height adjustment mechanism includes a vertical guide rail 401, an adjusting screw rod 402, and a connecting seat 403. The vertical guide rail 401 is fixedly connected to the top of the positioning support platform. The adjusting screw rod 402 is rotatably arranged in the vertical guide rail 401. The adjusting screw rod 402 is vertically arranged. A connecting seat 403 is slidably connected in the vertical guide rail 401. The connecting seat 403 is threadedly sleeved with the adjusting screw rod 402.

[0027] The air cylinder 404 is fixedly installed on the connecting seat 403. The air cylinder 404 is arranged perpendicular to the vertical guide rail 401. The flipping mechanism is arranged on the telescopic end of the air cylinder 404. The telescopic end of the air cylinder 404 is fixedly connected to the flipping mechanism. The flipping mechanism includes a connecting bracket 405, a flipping rotating shaft 408, a second driven gear 409, a second driving motor 410 and a second driving gear 411. The connecting bracket 405 is fixedly connected to the telescopic end of the air cylinder 404. A working cavity is provided inside the connecting bracket 405. The flipping rotating shaft 408 is rotatably arranged inside the working cavity, and the flipping rotating shaft 408 extends along the arrangement direction of the air cylinder 404. The second driven gear 409 is fixedly sleeved on the flipping rotating shaft 408. The second driving motor 410 is arranged inside the working cavity. The output end of the second driving motor 410 is fixedly connected with a second driving gear 411. The second driving gear 411 is in transmission connection with the second driven gear 409.

[0028] One end of the flipping rotating shaft 408 far away from the vertical guide rail 401 penetrates through the outer surface of the connecting bracket 405, and a flipping positioning member is fixedly connected to the end of the flipping rotating shaft 408 far away from the vertical guide rail 401. The flipping positioning member includes a flipping frame 406 and a limiting frame 407. The flipping frame 406 is fixedly connected to the end of the flipping rotating shaft 408 far away from the vertical guide rail 401. The flipping frame 406 is a U-shaped opening structure extending along the horizontal direction. An installation plane is provided on the flipping frame 406. The limiting frame 407 is fixedly connected to the installation plane. The limiting frame 407 is a conical structure for adapting to the pipe orifice structure on the truss, facilitating insertion into the pipe orifice. Thus, the vertical height of the truss is limited by the limiting frames 407 on two oppositely arranged first positioning modules. Part of the structure of the truss is placed on the flipping frame 406, and the truss is flipped by flipping the flipping frame 406.

[0029] The second positioning module includes a support platform 1 and a positioning mechanism 3. The support module only includes the support platform 1.

[0030] The support platform 1 includes a support base, a top plate 12 and a telescopic structure. The top plate 12 is arranged above the support base. A vertically height-adjustable telescopic structure is arranged between the top plate 12 and the support base. The telescopic structure includes a primary compensation mechanism and a secondary compensation mechanism. The primary compensation mechanism is arranged on the top of the secondary compensation mechanism. A connecting member is provided on the top plate 12 of the support platform 1 for detachably connecting with the bottom of the truss. The connection method can be through bundling with a strap. The connecting end of the strap is bundled with the truss and fixedly connected to the top plate 12.

[0031] A vertical sliding groove is opened on the top of the support base. A controller is arranged on the support base. A resistance strain gauge 11 electrically connected to the controller is arranged at the bottom of the vertical sliding groove.

[0032] The secondary compensation mechanism includes a support plate 6, a bracket 7, a support frame 8, a sliding carriage 9 and a plug rod 10. The support plate 6 is arranged on the upper part of the base. The bottom of the support plate 6 is fixedly connected with the plug rod 10. The plug rod 10 is slidably connected to the inside of the vertical chute. The bottom of the plug rod 10 is fixedly connected with a resistance strain gauge 11. The top of the support plate 6 is fixedly installed with a bracket 7. A chute with an upper opening is formed in the bracket 7. The sliding carriage 9 is slidably connected in the chute. The support frame 8 is arranged above the sliding carriage 9. The top end of the sliding carriage 9 is fixedly connected with the bottom of the support frame 8. A gap is left between the bottom of the support frame 8 and the support plate 6 to form an installation cavity 5. The driving mechanism is arranged on the bottom wall of the installation cavity 5 for driving the support frame 8 to move up and down.

[0033] The working principle of the resistance strain gauge 11 is that when the resistance strain gauge 11 is stressed, mechanical deformation will occur. The mechanical deformation causes the resistivity to change. When tensile deformation occurs, the resistance increases. When compressive deformation occurs, the resistance decreases.

[0034] The driving mechanism includes a lead screw 17, a first driven gear 18, a first motor 19 and a first driving gear 20. The lead screw 17 is vertically rotatably arranged on the top of the support plate 6. A threaded connection groove 16 with a lower opening is formed in the support frame 8. The threaded connection groove 16 is threadedly connected with the lead screw 17. The first motor 19 is fixedly installed on the top of the support plate 6. The output end of the first motor 19 is fixedly connected with the first driving gear 20. The lower part of the lead screw 17 is fixedly sleeved with the first driven gear 18. The first driven gear 18 is meshed and connected with the first driving gear 20. The first motor 19 is controlled and connected with the controller.

[0035] The primary compensation mechanism is arranged on the top of the support frame 8. The primary compensation mechanism includes an installation groove 13 with an upper opening, a sliding column 14 and an SMA spring 15. The installation groove 13 is formed on the top of the support frame 8. The bottom of the installation groove 13 is fixedly connected with the sliding column 14. A sliding avoidance groove is formed in the top plate 12. The upper part of the sliding column 14 is slidably connected with the sliding avoidance groove. The SMA spring 15 is movably sleeved on the outer surface of the sliding column 14. The upper end of the SMA spring 15 is fixedly connected with the bottom of the top plate 12. The lower end of the SMA spring 15 is fixedly connected with the bottom wall of the installation groove 13. The controller outputs current to the SMA spring 15. After the SMA spring 15 is energized, it heats up, expands and contracts to return to a fixed length, so as to automatically apply a reverse force to the deformation direction of the truss, thereby offsetting the thermal stress and reducing the deformation amount.

[0036] The positioning mechanism 3 is arranged on the top plate 12 of the corresponding support platform 1. Through the expansion and contraction of the primary compensation mechanism and the secondary compensation mechanism, the vertical position of the component is aligned with the vertical height of the truss, avoiding the misalignment of the weld joints caused by the deformation of the truss.

[0037] The positioning mechanism 3 includes a rotation adjustment mechanism, a slide rail 301, a sliding base 302, a rotating shaft 303, and a positioning frame 304. The slide rail 301 is arranged on the top of the corresponding top plate 12. The sliding base 302 is slidably connected to the slide rail 301. The rotating shaft 303 is rotatably arranged on the top of the sliding base 302. The rotating shaft 303 is arranged vertically. The top of the rotating shaft 303 is fixedly connected to the positioning frame 304. A positioning groove is formed on the positioning frame 304. The groove shape of the positioning groove is adapted to the shape of the component, so that when the component is placed in the groove, the component can be partially limited.

[0038] A locking member is arranged on the sliding base 302. The locking member is used to lock the sliding base 302 on the slide rail 301. The locking member includes a threaded locking hole 308. A jack is arranged on the sliding base 302. A locking bolt is inserted into the jack. The threaded locking holes 308 are arranged at intervals in the extending direction of the slide rail 301 on the top of the corresponding top plate 12. One end of the locking bolt close to the top plate 12 is threadedly connected to the inside of the corresponding threaded locking hole 308 at the upper and lower positions. After releasing the threaded connection between the locking bolt and the threaded locking hole 308, the sliding base 302 can slide on the slide rail 301 in the extending direction of the slide rail 301, so as to adjust the position of the sliding base 302.

[0039] The rotation adjustment mechanism is arranged on the top of the sliding base 302 and is used to drive the rotating shaft 303 to rotate. The rotation adjustment mechanism includes a rotating support 305, a worm 306, and a worm gear 307. The rotating support 305 is arranged on the top of the sliding base 302. The worm 306 is rotatably arranged on the rotating support 305. The worm gear 307 is fixedly sleeved on the lower part of the rotating shaft 303. The worm 306 is meshed with the worm gear 307. By driving the worm 306 to rotate, the worm gear 307 is driven to rotate, and then the rotating shaft 303 is driven to rotate, so as to adjust the angle of the positioning frame 304.

[0040] Working principle: Select an appropriate number of second positioning modules and support modules according to the welding work requirements. The second positioning modules and support modules are detachably connected to the first positioning module to form a welding platform. The truss is located between the oppositely arranged first positioning modules. The telescopic end of the cylinder 404 is telescoped to drive the limiting frames 407 to approach each other. At the same time, the limiting frames 407 extend into the pipe orifices of the truss, so as to clamp and fix the truss. The surface of the truss contacts the top plate 12 of the corresponding support table 1 below.

[0041] Place the component to be welded in the positioning groove on the positioning frame 304 for auxiliary positioning.

[0042] Then weld the component to the main structure of the truss. During the welding process, thermal expansion and contraction occur, and deformation occurs at the welding joint of the truss and the component. When a small deformation occurs, the SMA spring 15 is pre-tightened in the opposite direction of the deformation to apply prestress.

[0043] When the deformation increases, the support plate 6 sinks under force, driving the plug rod 10 to increase the pressure on the resistance strain gauge 11. When the deformation amount of the resistance strain gauge 11 ≥ the preset threshold, the controller sends a current pulse to the SMA spring 15, and the SMA spring 15 resets to generate a reverse displacement to offset the deformation.

[0044] If there is still residual deformation or a high deformation amount after the compensation of the SMA spring 15, secondary compensation is performed through manual intervention. The controller is controlled by the host computer to start the first motor 19, and the first motor 19 drives the lead screw 17 through gear transmission. The rotation of the lead screw 17 drives the support frame 8 to move vertically under the limiting action.

[0045] Thus, the deformation amount of a single deformation can be reduced through multi-level compensation, thereby improving the welding accuracy, reducing the cumulative error in welding, enhancing the structural strength of the welded product, reducing the positioning error, and facilitating positioning.

[0046] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A welding device for a stadium canopy truss structure that is easy to position, characterized in that: including a welding platform and a welding machine (2); The welding platform includes a plurality of welding modules, and the plurality of welding modules can be detachably connected to form a welding platform; The welding machine (2) is arranged outside the welding platform; The welding module comprises a second positioning module, two first positioning modules and a supporting module, wherein the second positioning module and the supporting module both comprise a supporting platform (1); The first positioning module comprises a clamping mechanism (4), and the clamping mechanism (4) is used to fix the vertical position of the truss; The support platform (1) comprises a support base, a top plate (12) and a telescopic structure, wherein the top plate (12) is arranged above the support base, and a telescopic structure with adjustable vertical height is arranged between the top plate (12) and the support base; The telescopic structure comprises a primary compensation mechanism and a secondary compensation mechanism, wherein the primary compensation mechanism is arranged on the top of the secondary compensation mechanism, the primary compensation mechanism can be telescoped in the up and down directions, the top of the primary compensation mechanism is fixedly connected to the top plate (12), a controller is arranged on the support base, and the primary compensation mechanism can be reset to a fixed length under the control of the controller; A vertical slide groove is provided at the top of the support base, the lower end of the secondary compensation mechanism is slidably inserted into the vertical slide groove, a resistance strain gauge (11) electrically connected to the controller is provided at the bottom of the vertical slide groove, and the lower end of the secondary compensation mechanism is fixedly connected to the outer surface of the resistance strain gauge (11); The secondary compensation mechanism can be extended and retracted up and down. A driving mechanism connected to the controller is provided on the secondary compensation mechanism. The driving mechanism is used to actively drive the secondary compensation mechanism to vertically extend and retract.

2. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 1 is characterized in that: The secondary compensation mechanism comprises a support plate (6), a bracket (7), a support frame (8), a slide frame (9) and an insertion rod (10); the support plate (6) is arranged on the upper part of the base; the bottom of the support plate (6) is fixedly connected to the insertion rod (10); the insertion rod (10) is slidably connected to the inside of the vertical slide groove; the bottom of the insertion rod (10) is fixedly connected to the resistance strain gauge (11); A bracket (7) is arranged on the top of the support plate (6), a slide groove with an upper opening is provided on the bracket (7), a slide frame (9) is slidably connected in the slide groove, a support frame (8) is arranged above the slide frame (9), and the top end of the slide frame (9) is fixedly connected to the bottom end of the support frame (8); A gap is left between the bottom of the support frame (8) and the support plate (6) to form a mounting cavity (5), and a driving mechanism is arranged on the bottom wall of the mounting cavity (5) to drive the support frame (8) to move up and down; The first-level compensation mechanism is arranged on the top of the support frame (8).

3. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 2 is characterized by: The driving mechanism comprises a screw rod (17), a first driven gear (18), a first motor (19) and a first driving gear (20); the screw rod (17) is vertically rotatably arranged on the top of the support plate (6); a threaded connection groove (16) with a lower opening is provided on the support frame (8); the threaded connection groove (16) is threadedly connected to the screw rod (17); The first motor (19) is fixedly mounted on the top of the support plate (6); the output end of the first motor (19) is fixedly connected to the first driving gear (20); the lower part of the screw rod (17) is fixedly sleeved with a first driven gear (18); the first driven gear (18) is meshingly connected to the first driving gear (20); and the first motor (19) is control-connected to the controller.

4. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 2 is characterized in that: The primary compensation mechanism comprises an upper-opening mounting groove (13), a sliding column (14) and an SMA spring (15); the mounting groove (13) is provided at the top of the support frame (8); the bottom of the mounting groove (13) is fixedly connected to the sliding column (14); a sliding avoidance groove is provided on the top plate (12); the upper part of the sliding column (14) is slidably connected to the sliding avoidance groove; the SMA spring (15) is movably sleeved on the outer surface of the sliding column (14); the upper end of the SMA spring (15) is fixedly connected to the bottom of the top plate (12); and the lower end of the SMA spring (15) is fixedly connected to the bottom wall of the mounting groove (13).

5. A welding device for a stadium canopy truss structure that is easy to position according to any one of claims 1 to 4, characterized in that: The second positioning module further comprises a positioning mechanism (3), wherein the positioning mechanism (3) is arranged on a corresponding top plate (12); The positioning mechanism (3) comprises a rotation adjustment mechanism, a slide rail (301), a sliding base (302), a rotating shaft (303) and a positioning frame (304); the slide rail (301) is arranged on the top of the corresponding top plate (12); the sliding base (302) is slidably connected to the slide rail (301); a rotating shaft (303) is rotatably provided on the top of the sliding base (302); the rotating shaft (303) is vertically arranged; the top of the rotating shaft (303) is fixedly connected to the positioning frame (304); and a positioning groove is provided on the positioning frame (304); A locking member is provided on the sliding base (302), and the locking member is used to lock the sliding base (302) on the sliding rail (301); The rotation adjustment mechanism is arranged on the top of the sliding base (302) and is used to drive the rotating shaft (303) to rotate.

6. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 5 is characterized by: The rotation adjustment mechanism comprises a rotation support (305), a worm (306) and a worm wheel (307); the rotation support (305) is arranged on the top of the sliding base (302); a worm (306) is rotatably arranged on the rotation support (305); the worm wheel (307) is fixedly sleeved on the lower part of the rotating shaft (303); and the worm (306) is meshingly connected with the worm wheel (307).

7. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 5 is characterized by: The locking member comprises a threaded locking hole (308), a socket is provided on the sliding base (302), a locking bolt is provided inside the socket, the threaded locking holes (308) are arranged in an array at intervals along the extension direction of the slide rail (301) at the top of the corresponding top plate (12), and one end of the locking bolt close to the top plate (12) is connected to the internal thread of the threaded locking hole (308) corresponding to the upper and lower positions.

8. A welding device for a stadium canopy truss structure that is easy to position according to any one of claims 1 to 4, characterized in that: The clamping mechanisms on the two first positioning modules are arranged opposite to each other, the first positioning module further comprises a positioning support platform, the positioning support platform is arranged on the ground, and the clamping mechanism (4) is arranged on the top of the positioning support platform; The clamping mechanism (4) comprises a height adjustment mechanism, a cylinder (404) and a turning mechanism, wherein the height adjustment mechanism is arranged on the top of the positioning support platform; The height adjustment mechanism comprises a vertical guide rail (401), an adjustment screw rod (402) and a connecting seat (403), wherein the vertical guide rail (401) is fixedly connected to the top of the positioning support platform, an adjustment screw rod (402) is rotatably arranged in the vertical guide rail (401), the adjustment screw rod (402) is arranged vertically, and a connecting seat (403) is slidably connected in the vertical guide rail (401), and the connecting seat (403) and the adjustment screw rod (402) are threadedly sleeved; The cylinder (404) is fixedly mounted on the connecting seat (403), the cylinder (404) is arranged perpendicular to the vertical guide rail (401), the turning mechanism is arranged on the telescopic end of the cylinder (404), and the telescopic end of the cylinder (404) is fixedly connected to the turning mechanism.

9. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 8, characterized in that: The flip mechanism comprises a connecting bracket (405), a flip shaft (408), a second driven gear (409), a second driving motor (410) and a second driving gear (411); the connecting bracket (405) is fixedly connected to the telescopic end of the cylinder (404); a working chamber is provided in the connecting bracket (405); the flip shaft (408) is rotatably arranged in the working chamber; the second driven gear (409) is fixedly sleeved on the flip shaft (408); the second driving motor (410) is arranged in the working chamber; the output end of the second driving motor (410) is fixedly connected to the second driving gear (411); and the second driving gear (411) is drivingly connected to the second driven gear (409); One end of the flip shaft (408) away from the vertical guide rail (401) passes through the outer surface of the connecting bracket (405), and one end of the flip shaft (408) away from the vertical guide rail (401) is fixedly connected to a flip positioning piece.

10. The welding equipment for the stadium canopy truss structure that is easy to position according to claim 9, characterized in that: The flip positioning member comprises a flip frame (406) and a limit frame (407); the flip frame (406) is fixedly connected to an end of the flip shaft (408) away from the vertical guide rail (401); The turning frame (406) is a U-shaped opening structure extending in the horizontal direction. A mounting plane is provided on the turning frame (406). A limiting frame (407) is fixedly connected to the mounting plane. The limiting frame (407) is a conical structure.

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