Multi-position welding device for welding steel truss

Abstract

The invention discloses a multi-position welding device for welding a steel truss, and relates to the technical field of truss welding, the multi-position welding device comprises symmetrically arranged supporting bases and further comprises a welding assembly arranged between the two supporting bases, and the welding assembly comprises positioning frames fixedly connected to the two supporting bases correspondingly; electric control bidirectional telescopic rods are fixedly connected between the opposite faces of the two positioning frames at equal intervals. Synchronous welding of the steel truss from the two ends to the center is achieved through opposite movement of the movable welding platform, during two-end synchronous welding, heat input is symmetrically distributed along the center of the truss, bending deformation caused by one-way welding can be effectively counteracted, heat is evenly distributed through two-way welding, and concentrated release of heat during one-side welding is avoided; and meanwhile, during two-way synchronous welding, the welding seams at the two ends are shrunk at the same time, and warping or dislocation of the other end caused by single-side welding can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of truss welding, and specifically provides a multi-position welding device for welding steel trusses. Background Art

[0002] A steel truss refers to a truss made of steel. In industrial and civil buildings, roof structures, crane beams, bridges, and hydraulic gates, etc., steel trusses are commonly used as the main load-bearing members. All kinds of tower structures, such as mast towers, television towers, and transmission line towers, etc., usually use space steel trusses composed of three-sided, four-sided or multi-sided plane trusses;

[0003] In the prior art, single-sided welding is mostly used for steel truss welding, that is, welding from one end of the steel truss to the other end. However, during single-sided welding, the heat is concentrated on one side of the weld, resulting in local metal thermal expansion and compressive plastic deformation. After cooling, the heated area shrinks, while the unheated area remains unchanged, forming bending deformation. Specifically, when welding the lower chord of the truss, single-sided welding will cause the weld area to arch upward and the other end to bend downward. At the same time, the heat input of single-sided welding causes tensile stress in the weld and the nearby area, while compressive stress is formed on the other side due to the lower temperature. This stress imbalance will cause the component to bend or twist towards the heated side, thereby resulting in uneven distribution of internal thermal stress in the steel truss;

[0004] In addition, the truss is composed of slender members, with a small cross-sectional moment of inertia and low flexural stiffness. During single-sided welding, even a small thermal deformation will be amplified into a significant overall deviation. As the deviation gradually accumulates, it will ultimately lead to the distortion of the truss welding cross-section, affecting the overall strength of the truss.

[0005] In view of this, in order to solve the above problems, we propose a multi-position welding device for welding steel trusses. Summary of the Invention

[0006] Technical Problems to be Solved

[0007] In view of the above, aiming at the deficiencies of the prior art, the present invention provides a multi-position welding device for welding steel trusses to solve the problems raised in the above background art.

[0008] Technical Solutions

[0009] To achieve the above object, the present invention provides the following technical solutions: A multi-position welding device for welding steel trusses includes symmetrically arranged support bases, and also includes a welding assembly arranged between the two support bases;

[0010] The welding assembly includes a positioning frame fixedly connected to two support bases respectively. There are equidistantly fixedly connected electric control bidirectional telescopic rods between the opposite surfaces of the two positioning frames. A connecting spring is sleeved on the outer surface of the electric control bidirectional telescopic rod. A limiting frame is fixedly connected to the center of the outer surface of the electric control bidirectional telescopic rod. The outer surfaces of both ends of the electric control bidirectional telescopic rod are slidably connected with a moving welding platform. A welding robotic arm is fixedly installed on the outer surface of the moving welding platform. The outer surface of the limiting frame is equidistantly rotatably connected with electric control driving rotating shafts. A connecting rope is wound around the outer surface of the electric control driving rotating shaft. One end of the connecting rope far from the electric control driving rotating shaft is fixedly connected with a driven block.

[0011] Preferably, there are eight electric control bidirectional telescopic rods arranged equidistantly with the center of the positioning frame as a reference, and the eight electric control bidirectional telescopic rods are distributed in an equilateral octagon structure. There are four groups of connecting springs, and each group of connecting springs is provided with two. The two connecting springs are symmetrically arranged with the vertical central axis of the electric control bidirectional telescopic rod as a reference. Both the limiting frame and the moving welding platform are arranged in an equilateral octagon structure.

[0012] Preferably, there are four welding robotic arms arranged in a circular array with the center of the moving welding platform as a reference, and the four welding robotic arms are spaced on the octagonal side surface of the moving welding platform. There are four electric control driving rotating shafts arranged in a circular array with the center of the limiting frame as a reference, and the four limiting frames are spaced on the octagonal side surface of the electric control driving rotating shaft. The driven block is fixedly connected to the moving welding platform. There are four driven blocks on each moving welding platform, and the four driven blocks are arranged in a circular array with the center of the moving welding platform as a reference, and the four driven blocks are spaced on the octagonal side surface of the moving welding platform. Each driven block is located between two adjacent welding robotic arms in the same vertical plane, and the driven block and the electric control driving rotating shaft are in the same inclined plane.

[0013] Preferably, it further includes a connecting component arranged on the positioning frame;

[0014] The connecting component includes a driving motor fixedly installed on the positioning frame through a support. A gear ring is fixedly connected to the output shaft end of the driving motor. There are equidistantly meshed driven gears inside the gear ring. A driven rotating wheel is fixedly connected to the side of each driven gear close to the positioning frame. A traction rope is wound around the outer surface of each driven rotating wheel. One end of the traction rope far from the driven rotating wheel is fixedly connected with a slider. The positioning frame is equidistantly penetrated with inclined sliding grooves with the center of the positioning frame as a reference. A damping spring telescopic rod is fixedly connected to the outer surface of the slider.

[0015] Preferably, there are four driven gears with the center of the gear ring as a reference. The driven rotating wheels are all rotatably connected to the outer wall of the positioning frame. The slider is slidably connected inside the inclined sliding groove. One end of the damping spring telescopic rod far from the slider is fixedly connected to the outer wall of the positioning frame.

[0016] Preferably, it further includes a clamping assembly disposed on the slider;

[0017] The clamping assembly includes an internal clamping member fixedly connected to the outer surface of the closer side of the positioning frame respectively. An external clamping member is slidably connected to the outer surface of the closer side of the positioning frame. A limiting groove is penetrated through the outer surface of the external clamping member. A clamping block is rotatably connected between the inner walls of the limiting groove through a rotating shaft. A limiting spring is sleeved on the outer surface of the rotating shaft in the limiting groove.

[0018] Preferably, four internal clamping members on each positioning frame are equidistantly arranged with reference to the center of the positioning frame, and four external clamping members on each positioning frame are equidistantly arranged with reference to the center of the positioning frame. Each external clamping member is fixedly connected to the slider.

[0019] Preferably, both the internal clamping member and the external clamping member are set as a broken line shape with an included angle of 90 degrees. The four internal clamping members on the same positioning frame jointly form a rectangular structure, and the four external clamping members on the same positioning frame jointly form a rectangular structure. The internal clamping member is arranged inside the external clamping member.

[0020] Preferably, both ends of the limiting spring are fixedly connected to the inner wall of the limiting groove and the outer wall of the clamping block respectively.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a multi-position welding device for welding steel trusses, having the following beneficial effects:

[0023] Through the opposite movement of the moving welding platform, the synchronous welding of the steel truss from both ends to the center is realized. When welding synchronously at both ends, the heat input is symmetrically distributed along the center of the truss, which can effectively offset the bending deformation caused by one-way welding. The two-way welding makes the heat evenly distributed, avoiding the concentrated release of heat during single-sided welding, thereby reducing the residual stress in the weld and the surrounding area and reducing the risk of post-weld cracking. At the same time, during two-way synchronous welding, the welds at both ends shrink simultaneously, which can avoid warping or dislocation at the other end caused by single-sided welding;

[0024] Through the frame-type setting of the external clamping member, the internal clamping member and the moving welding platform, the steel truss is in a ventilated state as a whole during the welding process, and at the same time, the direct contact between the clamping part and the steel truss is reduced, thereby realizing the rapid heat dissipation during the welding process of the steel truss, and further avoiding the thermal deformation caused by heat accumulation during the welding process of the steel truss;

[0025] Through the settings of the external clamping piece, the internal clamping piece and the clamping block, the main rods of steel trusses with different shapes can be fixed conveniently. The external clamping piece can position the main rods of the steel truss as a whole, ensuring that the rods maintain the designed position during the welding process and avoiding deviation caused by their own weight. The internal clamping piece can support the inside of the main rods of the steel truss, and the internal clamping piece and the external clamping piece can adapt to different rod sizes and shapes, thus completing the rapid clamping during the steel truss welding process. At the same time, the settings of the external clamping piece and the slider enable this welding device to adapt to the welding positioning of steel trusses with different sizes;

[0026] Through the settings of the gear ring, the driven gear, the driven runner and the traction rope, the four rods serving as the main rods of the steel truss can be fixed simultaneously. By rotating the gear ring to drive the synchronous rotation of multiple driven gears, the four traction ropes can be pulled simultaneously, ensuring the precise alignment of the four rods in the three-dimensional space. At the same time, the tension of the traction ropes is evenly distributed through the driven runner, avoiding the deviation of a certain rod due to uneven force, thus completing the rapid positioning of the four rods. In addition, during welding, the four traction ropes are symmetrically tightened through the gear ring system, enabling the rods to be uniformly constrained during welding and reducing deformation or cracks caused by local stress concentration. Brief Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the overall external structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the positional relationship at the slider of the present invention;

[0029] Figure 3 It is the present invention Figure 2 The enlarged schematic diagram of the structure at A in the present invention;

[0030] Figure 4 It is a schematic diagram of the positional relationship at the mobile welding platform of the present invention;

[0031] Figure 5 It is a schematic diagram of the positional relationship at the drive motor of the present invention;

[0032] Figure 6 It is the present invention Figure 5 The enlarged schematic diagram of the structure at B in the present invention;

[0033] Figure 7 It is a schematic diagram of the positional relationship at the driven block of the present invention;

[0034] Figure 8 It is the present invention Figure 7 The enlarged schematic diagram of the structure at C in the present invention;

[0035] Figure 9 It is a schematic diagram of the positional relationship at the internal clamping piece of the present invention;

[0036] Figure 10This is a schematic structural plan view of the positioning frame of the present invention.

[0037] In the figure: 11, support base;

[0038] 21, positioning frame; 22, electric control bidirectional telescopic rod; 23, connecting spring; 24, limiting frame; 25, moving welding platform; 26, welding robotic arm; 27, electric control driving rotating shaft; 28, connecting rope; 29, driven block;

[0039] 31, driving motor; 32, gear ring; 33, driven gear; 34, driven runner; 35, towing rope; 36, slider; 37, inclined sliding groove; 38, damping spring telescopic rod;

[0040] 41, internal clamping member; 42, external clamping member; 43, limiting groove; 44, clamping block; 45, limiting spring. Specific embodiments

[0041] 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.

[0042] Embodiments of the present invention

[0043] Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 9 and Figure 10 , a multi-position welding device for welding steel trusses, including symmetrically arranged support bases 11, and further including a welding assembly disposed between the two support bases 11;

[0044] The welding assembly includes positioning frames 21 respectively fixedly connected to the two support bases 11. Between the opposite surfaces of the two positioning frames 21, electric control bidirectional telescopic rods 22 are fixedly connected at equal intervals. A connecting spring 23 is sleeved on the outer surface of the electric control bidirectional telescopic rod 22. At the center of the outer surface of the electric control bidirectional telescopic rod 22, a limiting frame 24 is fixedly connected in common. On the outer surfaces of both ends of the electric control bidirectional telescopic rod 22, moving welding platforms 25 are slidably connected. A welding robotic arm 26 is fixedly installed on the outer surface of the moving welding platform 25. Electric control driving rotating shafts 27 are rotatably connected at equal intervals on the outer surface of the limiting frame 24. A connecting rope 28 is wound around the outer surface of the electric control driving rotating shaft 27. One end of the connecting rope 28 away from the electric control driving rotating shaft 27 is fixedly connected to a driven block 29.

[0045] Among them, eight electric control double telescopic rods 22 are equidistantly arranged with reference to the center of the positioning frame 21, and the eight electric control double telescopic rods 22 are distributed in an equilateral octagon structure. Four groups of connecting springs 23 are provided, and each group of connecting springs 23 is provided with two. The two connecting springs 23 are symmetrically arranged with reference to the vertical central axis of the electric control double telescopic rod 22. The limiting frame 24 and the moving welding platform 25 are both arranged in an equilateral octagon structure.

[0046] Among them, four welding robotic arms 26 are arranged in a circular array with reference to the center of the moving welding platform 25, and the four welding robotic arms 26 are spaced on the octagon side of the moving welding platform 25. Four electric control driving rotating shafts 27 are arranged in a circular array with reference to the center of the limiting frame 24, and the four limiting frames 24 are spaced on the octagon side of the electric control driving rotating shaft 27. The driven blocks 29 are fixedly connected to the moving welding platform 25. Four driven blocks 29 are provided on each moving welding platform 25. The four driven blocks 29 are arranged in a circular array with reference to the center of the moving welding platform 25, and the four driven blocks 29 are spaced on the octagon side of the moving welding platform 25. Each driven block 29 is located between two adjacent welding robotic arms 26 in the same vertical plane, and the driven block 29 and the electric control driving rotating shaft 27 are in the same inclined plane.

[0047] Among them, a micro motor inside the electric control driving rotating shaft 27 is used to control the rotation of the electric control driving rotating shaft 27 inside the limiting frame 24. Two connecting ropes 28 are symmetrically wound on the outer surface of the electric control driving rotating shaft 27, and the ends of the two connecting ropes 28 far from the electric control driving rotating shaft 27 are fixedly connected to the driven blocks 29.

[0048] Further embodiments

[0049] Please refer to Figures 1 to 3 、 Figure 5 、 Figure 6 and Figure 9 , the multi-position welding device for welding steel trusses further includes a connection component arranged on the positioning frame 21;

[0050] The connection component includes a driving motor 31 fixedly installed on the positioning frame 21 through a support. A gear ring 32 is fixedly connected to the output shaft end of the driving motor 31. Driven gears 33 are equally meshed inside the gear ring 32. Driven rotating wheels 34 are fixedly connected to the sides of the driven gears 33 close to the positioning frame 21. Traction ropes 35 are wound on the outer surfaces of the driven rotating wheels 34. One ends of the traction ropes 35 far from the driven rotating wheels 34 are fixedly connected to sliders 36. Inclined sliding grooves 37 are equally penetrated through the positioning frame 21 with reference to the center of the positioning frame 21. A damping spring telescopic rod 38 is fixedly connected to the outer surface of the slider 36.

[0051] Among them, there are four driven gears 33 arranged with reference to the center of the gear ring 32. The driven rotating wheels 34 are all rotatably connected to the outer wall of the positioning frame 21. The slider 36 is slidably connected to the inside of the inclined chute 37. One ends of the damping spring telescopic rods 38 far away from the slider 36 are fixedly connected to the outer wall of the positioning frame 21.

[0052] Among them, the damping spring telescopic rods 38 are mainly used to limit the movement track of the slider 36 and the reset of the slider 36.

[0053] Further embodiments

[0054] Please refer to Figure 4 and Figures 7 to 10 , the multi-position welding device for welding steel trusses further includes a clamping assembly arranged on the slider 36;

[0055] The clamping assembly includes an inner clamping member 41 fixedly connected to the inner surface of the adjacent sides of the positioning frame 21 respectively. The outer clamping members 42 are slidably connected to the outer surface of the adjacent sides of the positioning frame 21. A limiting groove 43 is penetrated through the outer surface of the outer clamping member 42. A clamping block 44 is rotatably connected between the groove walls of the limiting groove 43 through a rotating shaft. A limiting spring 45 is sleeved on the outer surface of the rotating shaft in the limiting groove 43.

[0056] Among them, there are four inner clamping members 41 on each positioning frame 21 arranged equidistantly with reference to the center of the positioning frame 21. There are four outer clamping members 42 on each positioning frame 21 arranged equidistantly with reference to the center of the positioning frame 21. Each outer clamping member 42 is fixedly connected to the slider 36.

[0057] Among them, both the inner clamping member 41 and the outer clamping member 42 are arranged in a zigzag shape with an included angle of 90 degrees. The four inner clamping members 41 on the same positioning frame 21 together form a rectangular structure. The four outer clamping members 42 on the same positioning frame 21 together form a rectangular structure. The inner clamping member 41 is arranged inside the outer clamping member 42.

[0058] Among them, both ends of the limiting spring 45 are fixedly connected to the groove wall of the limiting groove 43 and the outer wall of the clamping block 44 respectively.

[0059] The working process and principle of the overall content of the above embodiments are as follows:

[0060] The staff places the main rods of the steel truss to be welded inside the device, places one ends of the four main rods between the four groups of inner clamping members 41 and outer clamping members 42 respectively. Then the staff controls the driving motor 31 to start through an external controller. Subsequently, the gear ring 32 fixedly connected to the output shaft end of the driving motor 31 will move accordingly;

[0061] With the rotation of the gear ring 32, the four driven gears 33 engaged inside the gear ring 32 will rotate in the same direction, thereby driving the driven runner 34 fixedly connected thereto to rotate. During the rotation of the driven runner 34, the traction rope 35 wound around its outer surface will be wound up, thereby pulling the slider 36 fixedly connected to the other end of the traction rope 35 to move in the inclined chute 37 opened on the positioning frame 21 towards the center of the positioning frame 21;

[0062] During the above process, as the slider 36 moves, the damping spring telescopic rod 38 fixedly connected to the slider 36 will be stretched by the pulling force. The damping spring telescopic rod 38 is mainly used to limit the movement trajectory of the slider 36 and the reset of the slider 36;

[0063] It should be noted that since the external clamping member 42 is fixedly connected to the slider 36, as the slider 36 moves towards the center of the positioning frame 21, the external clamping member 42 will also move towards the center of the positioning frame 21. And since the internal clamping member 41 is arranged inside the external clamping member 42, and both the internal clamping member 41 and the external clamping member 42 are arranged in a zigzag shape with an angle of ninety degrees, and the internal clamping member 41 and the external clamping member 42 are both arranged in a rectangular distribution, during the movement of the external clamping member 42 towards the internal clamping member 41, the main steel truss rod will be fixed between the internal clamping member 41 and the external clamping member 42;

[0064] At the same time, due to the ninety-degree zigzag setting of the internal clamping member 41 and the external clamping member 42, one side of the main steel truss rod is abutted by the corner end of the internal clamping member 41, and at the same time, the other side of the main steel truss rod is located between the two inner side walls of the external clamping member 42 (specifically refer to Figure 9 ), and at the same time, since the external clamping member 42 is in a state of fitting the outer surface of the main steel truss rod at this time, the outer surface of the clamping block 44 rotatably connected to the external clamping member 42 by a rotating shaft will be in contact with the outer surface of the main steel truss rod and be in a state of fitting the outer surface of the main steel truss rod. And as the slider 36 drives the continuous movement of the external clamping member 42, the clamping block 44 will synchronously apply the same clamping force to the outer surface of the main steel truss rod;

[0065] It should be noted that due to the different designs of the steel trusses, that is, the shapes of the steel materials used as the main rods during the welding of the steel trusses are different between cylindrical steel materials and angle steels. When the external clamping member 42 fixes the cylindrical steel material, as the external clamping member 42 drives the clamping block 44 to move towards the internal clamping member 41, the outer surface of the clamping block 44 abuts against the outer surface of the cylindrical steel material. The clamping force applied by the clamping block 44 to the outer surface of the cylindrical steel material will be affected by the shape of the cylindrical steel material, thereby reversely applying a tangential force along the arc surface of the cylindrical steel material to the clamping block 44, causing the clamping block 44 to deflect away from the cylindrical steel material direction inside the limiting groove 43 opened on the external clamping member 42. During the deflection of the clamping block 44, the limiting spring 45 provided between the clamping block 44 and the groove wall of the limiting groove 43 is deformed. The deflection of the position of the clamping block 44 simultaneously applies the same clamping force to both side surfaces of the cylindrical steel material, and at the same time, it cooperates with the internal clamping member 41 that abuts against the outer surface of the cylindrical steel material to fix the cylindrical steel material;

[0066] At the same time, when welding a steel truss with an angle steel as the main rod, when the external clamping member 42 drives the clamping block 44 to move, it will directly contact the outer surface of the angle steel. And since the outer surfaces of the angle steel are all horizontal planes, the clamping block 44 will directly abut against the outer surface of the angle steel. And with the zigzag setting of the internal clamping member 41, the internal clamping member 41 can fit the inner wall of the angle steel, thereby fixing the position of the steel truss with the angle steel as the main rod;

[0067] Through the settings of the external clamping member 42, the internal clamping member 41, and the clamping block 44, the main rods of steel trusses with different shapes can be conveniently fixed. The external clamping member 42 can perform overall positioning on the main rod of the steel truss to ensure that the rod remains in the designed position during the welding process and avoid offset caused by its own weight. The internal clamping member 41 can support the inside of the main rod of the steel truss, and the internal clamping member 41 and the external clamping member 42 can adapt to different rod sizes and shapes, thereby completing the rapid clamping during the welding process of the steel truss. At the same time, the settings of the external clamping member 42 and the slider 36 enable this welding device to adapt to the welding positioning of steel trusses with different sizes;

[0068] Through the settings of the gear ring 32, the driven gear 33, the driven runner 34, and the traction rope 35, four rods serving as the main rods of the steel truss can be fixed simultaneously. By rotating the gear ring 32 to drive multiple driven gears 33 to rotate synchronously, four traction ropes 35 can be pulled simultaneously to ensure the precise alignment of the four rods in three-dimensional space. At the same time, the tension of the traction ropes 35 is evenly distributed through the driven runner 34 to avoid the offset of a certain rod due to uneven force, thereby completing the rapid positioning of the four rods. In addition, during welding, the four traction ropes 35 are symmetrically tightened through the gear ring 32 system, so that the rods are uniformly constrained during welding, reducing deformation or cracks caused by local stress concentration;

[0069] After one end of the steel truss member is fixed according to the above process, the staff fixes the other end of the steel truss member synchronously according to the above steps. It should be noted that since the electric control bidirectional telescopic rod 22 is arranged between the two positioning frames 21, when clamping and fixing steel truss members of different lengths, the staff can control the electric control bidirectional telescopic rod 22 to extend or contract to adjust the distance between the two positioning frames 21, so as to adapt to the welding of steel truss members of different lengths;

[0070] At the same time, the start and stop of the electric control bidirectional telescopic rod 22 are both realized through the controller, and this technical means is the prior art, so it will not be elaborated here;

[0071] After the main steel truss rods are fixed, the staff places the struts connecting the main rods between adjacent main rods, and then welds between the main steel truss rods and the struts;

[0072] The staff starts the electric control driving rotating shaft 27, so as to prompt the electric control driving rotating shaft 27 to rotate. It should be noted that there is a micro motor inside the electric control driving rotating shaft 27, which is used to control the rotation of the electric control driving rotating shaft 27 inside the limit frame 24. When the electric control driving rotating shaft 27 rotates, the connecting ropes 28 wound around its outer surface will be wound up. Since there are two connecting ropes 28 symmetrically wound around the outer surface of the electric control driving rotating shaft 27, and the ends of the two connecting ropes 28 far away from the electric control driving rotating shaft 27 are fixedly connected to the driven blocks 29, therefore, as the connecting ropes 28 are wound up, the two driven blocks 29 at the other ends of the connecting ropes 28 will be pulled by the connecting ropes 28 and move towards the limit frame 24;

[0073] It should be noted that the movement of the driven block 29 will drive the moving welding platform 25 fixedly connected to it to move synchronously. And since the moving welding platform 25 is slidably arranged on the outer surface of the electric control bidirectional telescopic rod 22, therefore, driven by the driven block 29, the moving welding platform 25 will move towards the limit frame 24 accordingly. During the movement of the moving welding platform 25, the connecting spring 23 arranged between the moving welding platform 25 and the limit frame 24 will be compressed;

[0074] At the same time, during the movement of the moving welding platform 25, the welding robotic arm 26 located on the moving welding platform 25 will be started synchronously, so as to complete the welding between the main steel truss rods and the struts. It should be noted that the welding operation of the welding robotic arm 26 is the prior art, so it will not be elaborated here. At the same time, since there are four welding robotic arms 26 arranged at equal intervals, and the four welding robotic arms 26 are arranged at intervals with the driven block 29, therefore, the welding of the steel truss by the welding robotic arm 26 will not be affected by the driven block 29;

[0075] During the above process, the movable welding platform 25 will move in a uniform straight line on the electric control double-acting telescopic rod 22 under the action of the driven block 29 and the connecting rope 28, so as to complete the welding operation starting from both ends of the steel truss and moving towards the center of the steel truss;

[0076] The synchronous welding of the steel truss from both ends to the center is realized by the opposite movement of the movable welding platform 25. When welding synchronously at both ends, the heat input is symmetrically distributed along the center of the truss, which can effectively offset the bending deformation caused by one-way welding. The two-way welding makes the heat evenly distributed, avoiding the concentrated release of heat during single-sided welding, thereby reducing the residual stress in the weld and the surrounding area and reducing the risk of post-weld cracking. At the same time, during two-way synchronous welding, the welds at both ends shrink simultaneously, which can avoid warping or misalignment at the other end caused by single-sided welding;

[0077] Through the frame-type setting of the external clamping member 42, the internal clamping member 41 and the movable welding platform 25, the steel truss is in a ventilated state as a whole during the welding process, and at the same time, the direct contact between the clamping part and the steel truss is reduced, so as to realize the rapid heat dissipation during the welding process of the steel truss, and further avoid the thermal deformation caused by heat accumulation during the welding process of the steel truss;

[0078] Moreover, the setting of multiple welding robotic arms 26 can meet the synchronous welding treatment of multiple positions of the steel truss, thereby shortening the welding time of the steel truss and completing the rapid welding of the steel truss;

[0079] After the steel truss is welded, the staff reversely controls the electric control drive rotating shaft 27 and the drive motor 31 according to the above steps, so that the movable welding platform 25 returns to its initial position under the rebound action of the connecting spring 23, and the slider 36 drives the external clamping member 42 to return to its initial state under the rebound action of the damping spring telescopic rod 38, so as to release the welded steel truss.

[0080] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0081] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-position welding device for welding steel trusses, comprising symmetrically arranged support bases (11), characterized in that: It further includes a welding assembly disposed between two support bases (11); The welding assembly includes positioning frames (21) respectively and fixedly connected to the two support bases (11). Between the opposite surfaces of the two positioning frames (21), there are equidistantly fixedly connected electric control bidirectional telescopic rods (22). A connecting spring (23) is sleeved on the outer surface of the electric control bidirectional telescopic rod (22). At the center of the outer surface of the electric control bidirectional telescopic rod (22), there is a common fixedly connected limit frame (24). On the outer surfaces of both ends of the electric control bidirectional telescopic rod (22), there are slidingly connected moving welding platforms (25). A welding robotic arm (26) is fixedly installed on the outer surface of the moving welding platform (25). On the outer surface of the limit frame (24), there are equidistantly rotatably connected electric control driving rotating shafts (27). A connecting rope (28) is wound around the outer surface of the electric control driving rotating shaft (27). One end of the connecting rope (28) far from the electric control driving rotating shaft (27) is fixedly connected to a driven block (29).

2. The multi-position welding device for welding steel trusses according to claim 1, wherein: There are eight electric control bidirectional telescopic rods (22) equidistantly arranged with reference to the center of the positioning frame (21), and the eight electric control bidirectional telescopic rods (22) are distributed in an equilateral octagon structure. There are four groups of connecting springs (23), and each group of connecting springs (23) has two respectively. The two connecting springs (23) are symmetrically arranged with reference to the vertical central axis of the electric control bidirectional telescopic rod (22). Both the limit frame (24) and the moving welding platform (25) are arranged in an equilateral octagon structure.

3. A multi-position welding device for welding steel trusses according to claim 2, characterized in that: There are four welding robotic arms (26) arranged in a circular array with reference to the center of the moving welding platform (25), and the four welding robotic arms (26) are spaced on the octagon side surfaces of the moving welding platform (25). There are four electric control driving rotating shafts (27) arranged in a circular array with reference to the center of the limit frame (24), and the four limit frames (24) are spaced on the octagon side surfaces of the electric control driving rotating shaft (27). The driven block (29) is fixedly connected to the moving welding platform (25). There are four driven blocks (29) on each moving welding platform (25). The four driven blocks (29) are arranged in a circular array with reference to the center of the moving welding platform (25), and the four driven blocks (29) are spaced on the octagon side surfaces of the moving welding platform (25). Each driven block (29) is located between two adjacent welding robotic arms (26) in the same vertical plane, and the driven block (29) and the electric control driving rotating shaft (27) are in the same inclined plane.

4. The multi-position welding device for welding steel trusses according to claim 1, characterized in that: It further includes a connecting assembly disposed on the positioning frame (21); The connecting component includes a driving motor (31) fixedly installed on the positioning frame (21) through a support. A gear ring (32) is fixedly connected to the output shaft end of the driving motor (31). Driven gears (33) are equidistantly meshed inside the gear ring (32). Driven rotating wheels (34) are fixedly connected to one side of the driven gears (33) close to the positioning frame (21). Traction ropes (35) are wound around the outer surfaces of the driven rotating wheels (34). One end of each traction rope (35) far from the driven rotating wheel (34) is fixedly connected to a slider (36). Inclined sliding grooves (37) are equidistantly penetrated through the positioning frame (21) with the center of the positioning frame (21) as a reference. A damping spring telescopic rod (38) is fixedly connected to the outer surface of the slider (36).

5. The multi-position welding device for welding steel trusses according to claim 4, characterized in that: Four driven gears (33) are arranged with the center of the gear ring (32) as a reference. The driven rotating wheels (34) are all rotatably connected to the outer wall of the positioning frame (21). The slider (36) is slidably connected inside the inclined sliding groove (37). One end of each damping spring telescopic rod (38) far from the slider (36) is fixedly connected to the outer wall of the positioning frame (21).

6. The multi-position welding device for welding steel trusses according to claim 4, characterized in that: It further includes a clamping component arranged on the slider (36); The clamping component includes inner clamping pieces (41) respectively fixedly connected to the outer surfaces of the relatively close sides of the positioning frame (21). Outer clamping pieces (42) are slidably connected to the outer surfaces of the relatively close sides of the positioning frame (21). A limiting groove (43) is penetrated through the outer surface of the outer clamping piece (42). A clamping block (44) is rotatably connected between the walls of the limiting groove (43) through a rotating shaft. A limiting spring (45) is sleeved on the outer surface of the rotating shaft in the limiting groove (43).

7. The multi-position welding device for welding steel trusses according to claim 6, wherein: Four inner clamping pieces (41) on each positioning frame (21) are equidistantly arranged with the center of the positioning frame (21) as a reference. Four outer clamping pieces (42) on each positioning frame (21) are equidistantly arranged with the center of the positioning frame (21) as a reference. Each outer clamping piece (42) is fixedly connected to the slider (36).

8. The multi-position welding device for welding steel trusses according to claim 7, wherein: Both the inner clamping piece (41) and the outer clamping piece (42) are arranged in a zigzag shape with an included angle of ninety degrees. The four inner clamping pieces (41) on the same positioning frame (21) jointly form a rectangular structure. The four outer clamping pieces (42) on the same positioning frame (21) jointly form a rectangular structure. The inner clamping piece (41) is arranged inside the outer clamping piece (42).

9. The multi-position welding device for welding steel trusses according to claim 6, wherein: Both ends of the limiting spring (45) are fixedly connected to the wall of the limiting groove (43) and the outer wall of the clamping block (44) respectively.

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