Electric arc welding device for metal guardrail

Abstract

The invention relates to the technical field of welding devices, in particular to a metal guardrail electric arc welding device which comprises a workbench, a mounting support is fixedly connected to the upper end of the workbench, a fixing mechanism used for calibrating the position of a transverse rod is arranged on the inner side of the mounting support, and two symmetrical supporting frames are fixedly connected to the upper end of the mounting support. Two sets of welding mechanisms used for welding guardrails are installed on the inner side of the supporting frame, a transverse pipe is preliminarily clamped and fixed through a first electric clamp at the upper end, the transverse pipe is prevented from moving in the adjusting process, and an arc-shaped rack of a positioning assembly can be unfolded to form a complete annular track surrounding a welding seam; and the first sliding blocks limit the racks to move only along the arc-shaped tracks, and it is ensured that the tracks are completely attached to the weld joints.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding devices, in particular to a metal guardrail arc welding device. BACKGROUND

[0002] In the field of metal guardrail manufacturing, the connection welding of the cross pipe and the elbow mainly relies on automatic / semi-automatic arc welding equipment. However, with the increasing requirements for welding strength, crack resistance and production efficiency of outdoor use of guardrails, the existing equipment has obvious technical pain points.

[0003] Firstly, there is a significant deficiency in the positioning accuracy of the workpiece. The existing equipment relies on manual calibration or simple positioning mechanism for the alignment of the cross pipe and the elbow. Manual calibration relies on the experience of the operator, and is prone to misalignment due to operation deviation. Even if the positioning mechanism driven by a threaded rod is equipped, it also lacks real-time detection and dynamic correction mechanism, and cannot adjust the movement trajectory according to the actual relative position of the cross pipe and the elbow, which eventually leads to welding reference deviation, resulting in defects such as welding deviation and virtual welding, and greatly increasing the scrap rate.

[0004] Secondly, the adaptability of the arc-shaped welding seam and the quality of the welding bead cannot be guaranteed. The connection welding seam of the cross pipe and the elbow is arc-shaped structure, while the existing arc welding equipment is designed based on straight-line welding track, and the welding gun angle needs to be adjusted frequently during welding to adapt to the arc-shaped track. Not only is the operation cumbersome, but also the welding breakpoints are prone to occur during the adjustment gap, which easily forms stress concentration at the breakpoints, leading to cracking of the welding seam during outdoor use of the guardrail. At the same time, the welding track of the existing equipment has fixed curvature, which cannot adapt to the arc-shaped welding seam of different specifications of the guardrail, has poor universality, and is difficult to stably form special welding beads (such as fish scale pattern welding bead) that can improve the strength of the welding seam, which cannot meet the use requirements of the guardrail for long-term wind load and fatigue resistance. Finally, the welding, fluxing and polishing processes are fragmented, and the production efficiency is low. The existing equipment relies on manual brushing for flux supply (low efficiency and uneven coating, affecting arc fusion effect), or uses fixed nozzles for spraying but lacks stirring mechanism, and the flux is prone to sedimentation and stratification after standing, affecting the use effect. The post-welding burr cleaning needs to transfer the workpiece from the welding station to the special polishing station, which not only increases the production time, but also increases the polishing difficulty due to the increased hardness of the cooled burr, and even may scratch the surface of the guardrail, further prolonging the processing cycle. Therefore, we propose a metal guardrail arc welding device. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art, the present application proposes a metal guardrail arc welding device.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a metal guardrail electric arc welding device, comprising a workbench, the upper end of the workbench is fixedly connected with a mounting bracket, the inner side of the mounting bracket is provided with a fixing mechanism for calibrating the position of the cross bar, the upper end of the mounting bracket is fixedly connected with two symmetrical support frames, the inner side of the support frame is provided with two groups of welding mechanisms for welding the guardrail, and the inner side of the support frame is provided with a second electric clamp between the two groups of welding mechanisms.

[0007] Preferably, the fixing mechanism comprises a limiting frame fixedly connected with the mounting bracket, the upper end of the limiting frame is provided with two infrared sensors, the inner side of the limiting frame is rotatably connected with a threaded rod, one side of the limiting frame is provided with a first motor, the output shaft of the first motor is fixedly connected with the threaded rod, the inner side of the limiting frame is slidably connected with two moving blocks, the upper and lower ends of the moving block are provided with first electric clamps, and the inner side of one of the two first electric clamps close to the lower end is threadedly connected with the threaded rod.

[0008] Preferably, the welding mechanism comprises a positioning assembly for calibrating the welding position, and the welding mechanism further comprises a welding assembly for welding the elbow.

[0009] Preferably, the positioning assembly comprises a first electric telescopic rod arranged on the inner side of the support frame, the output shaft of the first electric telescopic rod is fixedly connected with a fixed frame, the lower end of the fixed frame is provided with a second motor, the output shaft of the second motor is fixedly connected with a first bevel gear, the outer side of the first bevel gear is meshingly connected with two second bevel gears, the ends away from each other of the two second bevel gears are fixedly connected with first spur gears, and the ends away from each other of the two first spur gears are rotatably connected with the fixed frame through shafts.

[0010] Preferably, the outer side of the first spur gear is meshingly connected with an arc-shaped rack, one end of the arc-shaped rack is fixedly connected with a limiting plate, the other side of the arc-shaped rack is slidably connected with a fixed plate, the lower end of the fixed plate is fixedly connected with the fixed frame, the inner side of the fixed plate is fixedly connected with two groups of symmetrical first sliding blocks, and the first sliding blocks are slidably connected on the inner side of the arc-shaped rack.

[0011] Preferably, the outer side of the arc-shaped rack is slidably connected with a moving frame, the inner side of the moving frame is provided with a second spur gear, one side of the moving frame is provided with a second electric telescopic rod, and the output shaft of the second electric telescopic rod is rotatably connected with the second spur gear.

[0012] Preferably, the other side of the moving frame is fixedly connected with a first support, one side of the first support is provided with a third motor, the output shaft of the third motor is fixedly connected with an elastic clamping strip rotating shaft, the other end of the elastic clamping strip rotating shaft is fixedly connected with a second spur gear, the inner side of the moving frame is fixedly connected with two groups of symmetrical second sliding blocks, and the second sliding blocks are slidingly connected to the inner side of the arc-shaped rack.

[0013] Preferably, the welding assembly comprises a second support fixedly connected with the moving frame, the upper end of the second support is fixedly connected with a fourth motor, the output shaft of the fourth motor is fixedly connected with a fixed rotating shaft, the lower end of the fixed rotating shaft is fixedly connected with a rotating rod, one end of the rotating rod is rotatably connected with a three-way sleeve through a sleeve, the inner side of the three-way sleeve is slidingly connected with a moving rotating shaft, and the two ends of the moving rotating shaft are fixedly connected with connecting rods.

[0014] Preferably, the outer side of the fixed rotating shaft is fixedly connected with a third spur gear, the outer side of the third spur gear is meshingly connected with a chain, the inner side of the chain is meshingly connected with a fourth spur gear, the upper end of the fourth spur gear is rotatably connected with a liquid storage tank, the outer side of the liquid storage tank is fixedly connected with the moving frame, the lower end of the liquid storage tank is provided with a sealing ring, the inner side of the liquid storage tank is slidingly connected with a liquid discharge pipe, the cutout of the liquid discharge pipe is designed in a Chinese character shape, the outer side of the liquid discharge pipe is slidingly connected with the fourth spur gear, the upper end of the liquid discharge pipe is fixedly connected with a feeding pipe in the inside of the liquid storage tank, the upper end of the feeding pipe is fixedly connected with a stirring rod, and the lower end of the liquid discharge pipe is provided with an electromagnetic valve spray head.

[0015] Preferably, the outer side of the liquid storage tank is provided with a third electric telescopic rod, the output shaft of the third electric telescopic rod is fixedly connected with a connecting plate, the other end of the connecting plate is fixedly connected with a flexible polishing cylinder, and the inner side of the flexible polishing cylinder is fixedly connected with the electromagnetic valve spray head.

[0016] Compared with the prior art, the metal guardrail electric arc welding device has the following beneficial effects: 1、In the fixed mechanism, the horizontal pipe is preliminarily clamped and fixed through the first electric clamp at the upper end, so as to avoid displacement of the horizontal pipe during adjustment; the first electric clamp at the lower end is in transmission connection with the threaded rod, and when the first motor drives the threaded rod to rotate, the rotary motion can be converted into horizontal linear motion of the moving block, so as to drive the horizontal pipe to stably adjust the position and avoid position deviation caused by manual pushing; the relative positions of the two ends of the horizontal pipe and the elbow interface are detected in real time through the infrared sensor at the upper end of the limiting frame, the first motor is accurately controlled to start and stop through the feedback signal, so as to ensure that the horizontal pipe and the elbow connection part are completely aligned without manual visual judgment; finally, the whole process automation of "clamping-adjusting-detecting-calibrating" is realized, manual positioning error is significantly reduced, the basic precision of subsequent welding is improved, and welding defects caused by positioning deviation are reduced.

[0017] 2、The arc-shaped rack of the positioning assembly can be unfolded to form a complete annular track surrounding the weld: the second motor drives the bevel gear to drive two groups of arc-shaped racks to slide out synchronously along the fixed plate, the first sliding block limits the rack to move along the arc-shaped track only, so as to ensure that the track is completely matched with the weld; the moving frame moves along the track through the meshing of the second spur gear and the arc-shaped rack, and the track is switched to realize continuous welding of the arc-shaped weld, without welding breakpoints; the fourth motor drives the fixed rotating shaft to rotate, the rotating rod pulls the moving rotating shaft to swing back and forth through the three-way sleeve, and then the impurities are transmitted to the offset rotating shaft through the connecting rod, so that the welding head moves along the arc-shaped track with the moving frame and synchronously swings back and forth, forming a corrugated fish scale weld; compared with the linear weld of the prior art, the fish scale weld can increase the contact area of the weld and the base material, and enhance the strength and crack resistance of the weld; continuous welding avoids stress concentration at the breakpoint, and adapts to the anti-fatigue requirement of the metal guardrail for long-term outdoor use.

[0018] 3、The third spur gear is driven to rotate through the fixed rotating shaft, the fourth spur gear is driven to rotate through the chain, and then the drain pipe and the feeding pipe are synchronously rotated, the stirring rod at the upper end of the feeding pipe can continuously stir the flux in the liquid storage tank to prevent precipitation; the flux enters the drain pipe through the feeding pipe, and is accurately sprayed to the weld area by the electromagnetic valve spray head without manual brushing; the connecting plate is pushed downward by the third electric telescopic rod, the flexible polishing cylinder and the electromagnetic valve spray head are synchronously close to the weld, the flexible polishing cylinder can clean the burrs outside the weld in real time according to the welding progress during the welding process, and the flux sprayed by the electromagnetic valve spray head can flush the impurities generated by polishing at the same time, without separately transferring the workpiece for polishing after welding; compared with the step-by-step operation of the prior art, the welding-fluxing-polishing of the present scheme is integrated into a single process, the workpiece transfer time and manual intervention are reduced, and the processing efficiency is significantly improved; at the same time, the problems that the precipitation of the flux affects the welding effect and the burrs after welding are cooled and hardened to increase the polishing difficulty are avoided, and the processing quality is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1It is the whole structure schematic diagram of the application; Figure 2 It is the whole structure sectional view schematic diagram of the application; Figure 3 It is the whole structure schematic diagram of the positioning assembly of the application; Figure 4 It is the sectional view schematic diagram of the partial structure of the positioning assembly of the application Figure 1 ; Figure 5 It is the sectional view schematic diagram of the partial structure of the positioning assembly of the application Figure 2 ; Figure 6 It is the sectional view schematic diagram of the partial structure of the positioning assembly of the application Figure 3 ; Figure 7 It is the enlarged schematic diagram of the partial structure of the positioning assembly of the application; Figure 8 It is the sectional view schematic diagram of the partial structure of the welding assembly of the application Figure 1 ; Figure 9 It is the sectional view schematic diagram of the partial structure of the welding assembly of the application Figure 2 .

[0020] In the figure: 1, workbench; 2, mounting support; 3, fixing mechanism; 31, limiting frame; 32, threaded rod; 33, first motor; 34, moving block; 35, first electric clamp; 4, support frame; 5, infrared sensor; 6, second electric clamp; 7, welding mechanism; 71, positioning assembly; 711, first electric telescopic rod; 712, fixed frame; 713, second motor; 714, first bevel gear; 715, second bevel gear; 716, first spur gear; 717, arc-shaped gear rack; 718, limiting plate; 719, fixed plate; 7110, first sliding block; 7111, moving frame; 7112, second spur gear; 7113, second electric telescopic rod; 7114, first support; 7115, third motor; 7116, elastic clamping strip rotating shaft; 7117, second sliding block; 72, welding assembly; 721, second support; 722, fourth motor; 723, fixed rotating shaft; 724, rotating rod; 725, three-way sleeve; 726, moving rotating shaft; 727, connecting rod; 728, offset rotating shaft; 729, connecting frame; 7210, third spur gear; 7211, chain; 7212, fourth spur gear; 7213, liquid discharge pipe; 7214, feeding pipe; 7215, liquid storage tank; 7216, stirring rod; 7217, electromagnetic valve spray head; 7218, flexible polishing cylinder; 7219, connecting plate; 7220, third electric telescopic rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application.

[0022] The following electrical elements are electrically connected through the PLC controller of the peripheral device.

[0023] Please refer to Figures 1-9 The utility model provides a metal guardrail electric arc welding device, including the workbench 1, the upper end of workbench 1 is fixedly connected with the mounting bracket 2, the inboard of mounting bracket 2 is provided with the fixed mechanism 3 for calibrating the position of cross rod, the upper end of mounting bracket 2 is fixedly connected with two symmetrical support frames 4, the inboard of support frame 4 is installed with two groups of welding mechanism 7 for welding guardrail, the inboard of support frame 4 is installed with the second electric clamp 6 between two groups of welding mechanism 7.

[0024] In the embodiment, the fixed mechanism 3 includes the limiting frame 31 fixedly connected with the mounting bracket 2, the upper end of limiting frame 31 is provided with two infrared sensors 5, the inboard of limiting frame 31 is rotatably connected with the threaded rod 32, one side of limiting frame 31 is installed with the first motor 33, the output shaft of first motor 33 is fixedly connected with threaded rod 32, the inboard of limiting frame 31 is slidably connected with two moving blocks 34, the upper and lower ends of moving block 34 are provided with the first electric clamp 35, the inboard of one of the first electric clamp 35 close to the lower end is threadedly connected with threaded rod 32.

[0025] Specifically, the mounting bracket 2 is used for fixing the limiting frame 31 and the support frame 4, and provides a mounting basis for the fixed mechanism 3 and the welding mechanism 7; the limiting frame 31 provides horizontal sliding guidance for the moving block 34 and limits the installation position of the threaded rod 32; the infrared sensor 5 is used for detecting the relative position of the two ends of the cross pipe and the elbow interface in real time, and the first motor 33 is started and stopped through a feedback signal to realize accurate alignment of the cross pipe and the elbow; the threaded rod 32 converts the rotary motion of the first motor 33 into the horizontal linear motion of the moving block 34 through thread cooperation with the first electric clamp 35 at the lower end; the first motor 33 provides power for the rotation of the threaded rod 32 and is a power source for driving the moving block 34 to move; the moving block 34 is used for installing the first electric clamp 35 at the upper and lower ends and drives the cross pipe to move synchronously to adjust the position; the first electric clamp 35 at the upper end is used for clamping and fixing the cross pipe to realize preliminary positioning of the cross pipe; the first electric clamp 35 at the lower end has the functions of "clamping and fixing" and "transmission", and is in transmission connection with the threaded rod 32 when clamped to rotate with the threaded rod 32 and drive the moving block 34 to slide.

[0026] In the embodiment, the welding mechanism 7 includes the positioning assembly 71 for calibrating the welding position, and further includes the welding assembly 72 for welding the elbow.

[0027] Specifically, the welding mechanism 7 is the core welding unit of the device, and is used as a whole to realize arc welding of the connection part between the metal guardrail elbow and the horizontal pipe; the positioning assembly 71 is used to calibrate the welding position, and provides accurate guidance for the movement of the welding assembly 72 by unfolding to form a track surrounding the weld; the welding assembly 72 is specially used for welding the connection weld between the guardrail elbow and the horizontal pipe, and can realize fish scale weld forming at the same time, thereby ensuring the welding quality.

[0028] In this embodiment, the positioning assembly 71 comprises a first electric telescopic rod 711 arranged on the inner side of the support frame 4, the output shaft of the first electric telescopic rod 711 is fixedly connected with a fixed frame 712, the lower end of the fixed frame 712 is provided with a second motor 713, the output shaft of the second motor 713 is fixedly connected with a first bevel gear 714, the outer side of the first bevel gear 714 is meshingly connected with two second bevel gears 715, the ends away from each other of the two second bevel gears 715 are fixedly connected with first spur gears 716, and the ends away from each other of the two first spur gears 716 are rotatably connected with the fixed frame 712 through shafts.

[0029] Specifically, the support frame 4 provides mounting support for the first electric telescopic rod 711 and is the mounting carrier of the positioning assembly 71; the first electric telescopic rod 711 is used to push the fixed frame 712 to move horizontally towards the direction of the weld, so as to adjust the positioning assembly 71 to the preset working position; the fixed frame 712 is used to mount the second motor 713, the first spur gears 716 and the subsequent fixed plate 719, and provides a mounting basis for the transmission components of the positioning assembly 71; the second motor 713 provides power for the transmission of the positioning assembly 71 and drives the first bevel gear 714 to rotate; the first bevel gear 714 acts as a driving bevel gear and drives the two second bevel gears 715 to rotate in opposite directions through meshing transmission, so as to realize power transmission in different directions; the second bevel gears 715 act as driven bevel gears and transmit the power of the first bevel gear 714 to the first spur gears 716, so as to drive the first spur gears 716 to rotate synchronously; the first spur gears 716 convert the rotary motion into sliding motion of the arc-shaped rack 717 through meshing with the arc-shaped rack 717; and the shafts are used to limit the rotary track of the first spur gears 716 and ensure stable rotation of the first spur gears 716 on the fixed frame 712.

[0030] In this embodiment, the outer side of the first spur gear 716 is meshingly connected with the arc-shaped rack 717, one end of the arc-shaped rack 717 is fixedly connected with a limiting plate 718, the other side of the arc-shaped rack 717 is slidably connected with a fixed plate 719, the lower end of the fixed plate 719 is fixedly connected with the fixed frame 712, the inner side of the fixed plate 719 is fixedly connected with two groups of first sliding blocks 7110 which are symmetrically arranged, and the first sliding blocks 7110 are slidably connected on the inner side of the arc-shaped rack 717.

[0031] Specifically, the first spur gear 716 is driven to slide by engaging the arcuate rack 717, and is a power transmission component of the arcuate rack 717; the arcuate rack 717 is used to form a circular track around the weld, and provides guidance for the movement of the moving frame 7111; the limiting plate 718 is used to limit the sliding stroke of the arcuate rack 717, prevent the arcuate rack 717 from sliding excessively, and ensure that the two groups of arcuate racks 717 form a complete circular track after being unfolded; the fixed plate 719 is used to fix the first sliding block 7110, and at the same time provides sliding support for the arcuate rack 717 and limits the sliding direction of the arcuate rack 717; the first sliding block 7110 is embedded in the sliding groove of the arcuate rack 717, which limits the deflection of the arcuate rack 717 when it slides, and ensures that the arcuate rack 717 moves stably along the preset arc-shaped track.

[0032] In this embodiment, the outer side of the arcuate rack 717 is slidingly connected with the moving frame 7111, the inner side of the moving frame 7111 is provided with the second spur gear 7112, one side of the moving frame 7111 is provided with the second electric telescopic rod 7113, and the output shaft of the second electric telescopic rod 7113 is rotatably connected with the second spur gear 7112.

[0033] Specifically, the arcuate rack 717 serves as a moving track of the moving frame 7111, and provides guidance for the arc-shaped movement of the moving frame 7111; the moving frame 7111 is used to install the welding assembly 72, the second spur gear 7112 and the first support 7114, drive the welding assembly 72 to move along the arc-shaped track, and realize full-coverage welding of the weld; the second spur gear 7112 converts the rotary power into the arc-shaped movement power of the moving frame 7111 through the meshing transmission with the arcuate rack 717; the second electric telescopic rod 7113 is used to push the second spur gear 7112 to move close to or away from the arcuate rack 717, realize the meshing or separation of the second spur gear 7112 and the arcuate rack 717, and then complete the track switching.

[0034] In this embodiment, the other side of the moving frame 7111 is fixedly connected with the first support 7114, one side of the first support 7114 is provided with the third motor 7115, the output shaft of the third motor 7115 is fixedly connected with the elastic clamping strip shaft 7116, the other end of the elastic clamping strip shaft 7116 is fixedly connected with the second spur gear 7112, the inner side of the moving frame 7111 is fixedly connected with two groups of symmetrical second sliding blocks 7117, and the second sliding blocks 7117 are slidingly connected to the inner side of the arcuate rack 717.

[0035] Specifically, the moving frame 7111 provides a mounting base for the first support 7114 and the second sliding block 7117; the first support 7114 is used for fixing the third motor 7115, providing stable mounting support for the third motor 7115; the third motor 7115 provides power for the rotation of the second spur gear 7112, and is the power source for the movement of the moving frame 7111; the elastic clamping strip rotating shaft 7116 is used for transmitting the power of the third motor 7115 to the second spur gear 7112, and has an elastic clamping effect at the same time, ensuring that the second spur gear 7112 stably engages with another set of arc-shaped racks 717 when the track is switched; the second spur gear 7112 drives the moving frame 7111 to move along the arc-shaped rack 717 through rotation; the second sliding block 7117 is embedded in the sliding groove of the arc-shaped rack 717, limiting the deflection of the moving frame 7111 when sliding, and ensuring the stable movement of the moving frame 7111 along the arc-shaped track.

[0036] In the embodiment, the welding assembly 72 includes a second support 721 fixedly connected with the moving frame 7111, the upper end of the second support 721 is fixedly connected with a fourth motor 722, the output shaft of the fourth motor 722 is fixedly connected with a fixed rotating shaft 723, the lower end of the fixed rotating shaft 723 is fixedly connected with a rotating rod 724, one end of the rotating rod 724 is rotatably connected with a three-way sleeve 725 through a sleeve, the inner side of the three-way sleeve 725 is slidably connected with a moving rotating shaft 726, both ends of the moving rotating shaft 726 are fixedly connected with connecting rods 727, the lower ends of the two connecting rods 727 are fixedly connected with an offset rotating shaft 728, a welding machine is arranged on the outer side of the offset rotating shaft 728, the both ends of the offset rotating shaft 728 are rotatably connected with a connecting frame 729, the upper end of the connecting frame 729 is fixedly connected with the moving frame 7111, and the inner side of the connecting frame 729 is rotatably connected with the fixed rotating shaft 723.

[0037] Specifically, the moving frame 7111 provides a mounting base for the second support 721 and the connecting frame 729, and drives the overall movement of the welding assembly 72; the second support 721 is used to fix the fourth motor 722 and provide mounting support for the fourth motor 722; the fourth motor 722 provides power for the weld formation of the welding assembly 72 and drives the fixed rotating shaft 723 to rotate; the fixed rotating shaft 723 is used to drive the rotating rod 724 to move in a circular motion and provide rotating support for the connecting frame 729; the rotating rod 724 drives the three-way sleeve 725 to move through circular motion, converting the rotary motion into a push-pull action of the three-way sleeve 725; the sleeve is used to realize the rotating connection between the rotating rod 724 and the three-way sleeve 725, ensuring smooth relative movement between the two; the three-way sleeve 725 drives the moving rotating shaft 726 to oscillate back and forth by sliding along the axial direction of the moving rotating shaft 726; the moving rotating shaft 726 drives the deflection rotating shaft 728 to deflect through the connecting rod 727; the connecting rod 727 is used to transmit the oscillation power of the moving rotating shaft 726 to the deflection rotating shaft 728, realizing power transmission; the deflection rotating shaft 728 is used to install the welding machine and drive the welding machine to oscillate back and forth, forming a fish-scale pattern weld; the welding machine is used to generate an electric arc to realize the electric arc welding of the metal guardrail weld; the connecting frame 729 is used to fix the deflection rotating shaft 728 and limit the deflection rotating shaft 728 from shaking, while providing rotating support for the fixed rotating shaft 723 to ensure stable movement of the welding assembly 72.

[0038] In the embodiment, the outer side of the fixed rotating shaft 723 is fixedly connected with a third spur gear 7210, the outer side of the third spur gear 7210 is meshingly connected with a chain 7211, the inner side of the chain 7211 is meshingly connected with a fourth spur gear 7212, the upper end of the fourth spur gear 7212 is rotatably connected with a liquid storage tank 7215, the outer side of the liquid storage tank 7215 is fixedly connected with the moving frame 7111, the lower end of the liquid storage tank 7215 is provided with a sealing ring, the inner side of the liquid storage tank 7215 is slidably connected with a drain pipe 7213, the cutout of the drain pipe 7213 is designed in a Chinese character shape, the outer side of the drain pipe 7213 is slidably connected with the fourth spur gear 7212, the upper end of the drain pipe 7213 is fixedly connected with a feeding pipe 7214 in the inside of the liquid storage tank 7215, the upper end of the feeding pipe 7214 is fixedly connected with a stirring rod 7216, and the lower end of the drain pipe 7213 is provided with an electromagnetic valve spray head 7217.

[0039] Specifically, the fixed rotating shaft 723 drives the third spur gear 7210 to rotate synchronously, providing power for the stirring and spraying of the flux; the third spur gear 7210 drives the chain 7211 to move through meshing, realizing power transmission; the chain 7211 is used to connect the third spur gear 7210 and the fourth spur gear 7212, and transmit the rotating power of the third spur gear 7210 to the fourth spur gear 7212; the fourth spur gear 7212 drives the drain pipe 7213 to rotate through cooperation with the Chinese character-shaped section surface of the drain pipe 7213; the liquid storage tank 7215 is used to store the flux, providing a containing space for the flux, and is fixed with the moving frame 7111 and moves synchronously with the moving frame 7111; the sealing ring is used to seal the connection between the liquid storage tank 7215 and the drain pipe 7213, preventing the flux from leaking; the drain pipe 7213 is used to transport the flux, and the Chinese character-shaped notch design can realize transmission cooperation and relative sliding with the fourth spur gear 7212 at the same time; the upper end of the drain pipe 7213 is connected with the feed pipe 7214, and the lower end is connected with the electromagnetic valve spray head 7217, forming a flux conveying channel; the feed pipe 7214 is used to guide the flux in the liquid storage tank 7215 into the drain pipe 7213, and rotates with the drain pipe 7213 to drive the stirring rod 7216 to rotate; the stirring rod 7216 is used to stir the flux in the liquid storage tank 7215, preventing the flux from precipitating and ensuring the uniformity of the flux; the electromagnetic valve spray head 7217 sprays the flux transported by the drain pipe 7213 to the weld area accurately under the control of the electromagnetic valve, assisting welding.

[0040] In the embodiment, the outer side of the liquid storage tank 7215 is provided with a third electric telescopic rod 7220, the output shaft of the third electric telescopic rod 7220 is fixedly connected with a connecting plate 7219, the other end of the connecting plate 7219 is fixedly connected with a flexible polishing cylinder 7218, and the inner side of the flexible polishing cylinder 7218 is fixedly connected with the electromagnetic valve spray head 7217.

[0041] Specifically, the liquid storage tank 7215 provides mounting support for the third electric telescopic rod 7220; the third electric telescopic rod 7220 is used to push the connecting plate 7219 to move up and down, adjusting the distance between the flexible polishing cylinder 7218, the electromagnetic valve spray head 7217 and the weld; the connecting plate 7219 is used to connect the third electric telescopic rod 7220 and the flexible polishing cylinder 7218, transmitting the push-pull power of the third electric telescopic rod 7220 to drive the flexible polishing cylinder 7218 and the electromagnetic valve spray head 7217 to move synchronously; the flexible polishing cylinder 7218 is used to adhere to the surface of the weld, cleaning the welding burrs on the outer side of the weld synchronously with the welding progress, avoiding damage to the weld by rigid polishing; the electromagnetic valve spray head 7217 can flush the flexible polishing cylinder 7218 to clean the generated impurities while spraying the flux, further improving the surface quality of the weld.

[0042] The working principle is that when in use, the guardrail elbow is placed inside the second electric clamp 6 between the two sets of welding mechanisms 7, and the vertical part of the elbow is fixed through the clamping action of the second electric clamp 6; then the horizontal transverse pipe is placed inside the first electric clamp 35 at the upper end of the two moving blocks 34, and the preliminary fixation of the transverse pipe is realized through the clamping action of the first electric clamp 35 at the upper end, and then the accurate alignment and calibration of the transverse pipe and the elbow are carried out: first, the first electric clamp 35 at the lower end of the moving block 34 is started to tightly clamp the inside of the threaded rod 32, forming a transmission connection; then the first motor 33 on one side of the limiting frame 31 is started, the output shaft of the first motor 33 drives the threaded rod 32 to rotate, and through the threaded connection between the threaded rod 32 and the first electric clamp 35 at the lower end, the moving block 34 is driven to slide horizontally along the inside of the limiting frame 31, and then the transverse pipe is driven to move synchronously; in this process, the two infrared sensors 5 at the upper end of the limiting frame 31 detect the relative position of the two ends of the transverse pipe and the elbow interface in real time, and the start and stop of the first motor 33 are controlled through the feedback signal until the two ends of the transverse pipe are accurately aligned with the connecting part of the elbow; Next, the positioning assembly 71 of the welding mechanism 7 is started to realize the surrounding of the welding track: the first electric telescopic rod 711 inside the support frame 4 is started, the output shaft of the first electric telescopic rod 711 pushes the fixed frame 712 to move horizontally towards the welding seam until the positioning assembly 71 reaches the preset working position; the second motor 713 at the lower end of the fixed frame 712 is started, the output shaft of the second motor 713 drives the first bevel gear 714 to rotate, the first bevel gear 714 is engaged with the two second bevel gears 715 to rotate in opposite directions, and then the two first spur gears 716 are driven to rotate synchronously through the second bevel gears 715; the first spur gears 716 are engaged with the arc-shaped racks 717 to drive the two sets of arc-shaped racks 717 to slide outward along the inside of the fixed plate 719, in the sliding process, the first sliding block 7110 inside the fixed plate 719 is embedded in the sliding groove of the arc-shaped rack 717, so that the arc-shaped rack 717 is limited to move along the preset arc-shaped track without deviation, until the limiting plate 718 at one end of the arc-shaped rack 717 is attached to the fixed plate 719, at this time, the two sets of arc-shaped racks 717 are opened to form a complete annular track surrounding the welding seam; Afterwards, the movement of the welding head along the track of the weld is realized by the movement of the moving frame 7111: the second electric telescopic rod 7113 on one side of the moving frame 7111 is started, the output shaft of which pushes the second spur gear 7112 to move in the direction of the arc-shaped rack 717 until the second spur gear 7112 is completely engaged with one set of arc-shaped racks 717; the third motor 7115 on one side of the first support 7114 is started, the output shaft of which drives the second spur gear 7112 to rotate through the elastic clamping strip rotating shaft 7116, under the engagement of the second spur gear 7112 and the arc-shaped rack 717, in combination with the sliding limit of the second sliding block 7117 inside the moving frame 7111 along the sliding groove of the arc-shaped rack 717, the moving frame 7111 drives the welding assembly 72 to move along the track of the arc-shaped rack 717, realizing the welding of the welding head on the current area of the weld; when the moving frame 7111 moves to the end of the set of arc-shaped racks 717, the second electric telescopic rod 7113 is started again, the output shaft of which pushes the second spur gear 7112 to move linearly in the direction of the other set of arc-shaped racks 717, while the elastic clamping strip rotating shaft 7116 ensures the stable engagement of the second spur gear 7112 and the other set of arc-shaped racks 717 through the elastic compression action, after completing the track switching, the welding head is continuously driven to move, realizing the continuous welding of the other half of the weld; During the welding process, the fish-scale weld formation is realized by the welding assembly 72: the fourth motor 722 on the upper end of the second support 721 is started, the output shaft of which drives the fixed rotating shaft 723 to rotate, the fixed rotating shaft 723 drives the rotating rod 724 at the lower end to make circular motion; one end of the rotating rod 724 is connected with the three-way sleeve 725 through the sleeve, in the process of circular motion, the three-way sleeve 725 slides along the axis of the moving rotating shaft 726, and then drives the moving rotating shaft 726 to make reciprocating swing; the moving rotating shaft 726 transmits the swing to the offset rotating shaft 728 through the connecting rods 727 at both ends, so that the offset rotating shaft 728 is synchronously reciprocated under the limit of the connecting frame 729; on the basis of the movement of the moving frame 7111 along the arc-shaped track, the offset rotating shaft 728 drives the welding head to make synchronous reciprocating swing, so that the movement track of the welding head is in a wave shape, thereby forming a fish-scale weld on the surface of the weld; Meanwhile, the welding process synchronously completes the fluxing and the weld cleaning: when the fixed rotating shaft 723 rotates, the outer third spur gear 7210 rotates synchronously, the third spur gear 7210 drives the fourth spur gear 7212 to rotate through the chain 7211; the fourth spur gear 7212 cooperates with the middle-shaped section of the drain pipe 7213 to drive the drain pipe 7213 to rotate synchronously, and then drives the stirring rod 7216 in the liquid storage tank 7215 to rotate through the feed pipe 7214, so as to continuously stir the flux in the liquid storage tank 7215 to prevent precipitation; the flux enters the drain pipe 7214 through the feed pipe 7214, and is accurately sprayed to the weld area through the electromagnetic valve spray head 7217 at the lower end under the control of the electromagnetic valve; the third electric telescopic rod 7220 outside the liquid storage tank 7215 is started, the output shaft of the third electric telescopic rod 7220 drives the connecting plate 7219 to move downward, drives the flexible polishing cylinder 7218 to synchronously approach and adhere to the weld surface with the electromagnetic valve spray head 7217, the flexible polishing cylinder 7218 synchronously cleans the welding burrs outside the weld with the welding progress, and at the same time, the flux sprayed by the electromagnetic valve spray head 7217 flushes and removes the impurities generated in the cleaning, further improving the welding quality.

[0043] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A metal guardrail arc welding device, comprising a workbench (1), characterized in that: The upper end of the workbench (1) is fixedly connected to a mounting bracket (2). The inner side of the mounting bracket (2) is provided with a fixing mechanism (3) for calibrating the position of the crossbar. The upper end of the mounting bracket (2) is fixedly connected to two symmetrical support frames (4). The inner side of the support frame (4) is equipped with two sets of welding mechanisms (7) for welding the guardrail. The inner side of the support frame (4) is equipped with a second electric clamp (6) between the two sets of welding mechanisms (7).

2. The metal guardrail arc welding device according to claim 1, characterized in that: The fixing mechanism (3) includes a limiting frame (31) fixedly connected to the mounting bracket (2). Two infrared sensors (5) are provided at the upper end of the limiting frame (31). A threaded rod (32) is rotatably connected to the inner side of the limiting frame (31). A first motor (33) is installed on one side of the limiting frame (31). The output shaft of the first motor (33) is fixedly connected to the threaded rod (32). Two moving blocks (34) are slidably connected to the inner side of the limiting frame (31). A first electric clamp (35) is provided at both the upper and lower ends of the moving block (34). The inner side of the first electric clamp (35) near the lower end of one of the two first electric clamps (35) is threadedly connected to the threaded rod (32).

3. The metal guardrail arc welding device according to claim 1, characterized in that: The welding mechanism (7) includes a positioning component (71) for calibrating the welding position, and the welding mechanism (7) also includes a welding component (72) for welding elbows.

4. The metal guardrail arc welding device according to claim 3, characterized in that: The positioning component (71) includes a first electric telescopic rod (711) disposed inside the support frame (4). The output shaft of the first electric telescopic rod (711) is fixedly connected to a fixed frame (712). A second motor (713) is installed at the lower end of the fixed frame (712). A first bevel gear (714) is fixedly connected to the output shaft of the second motor (713). Two second bevel gears (715) are meshed on the outer side of the first bevel gear (714). A first spur gear (716) is fixedly connected to the two ends of the two second bevel gears (715) that are far apart. The two ends of the two first spur gears (716) that are far apart are rotatably connected to the fixed frame (712) through a rotating shaft.

5. The metal guardrail arc welding device according to claim 4, characterized in that: The outer side of the first spur gear (716) is meshed with an arc-shaped rack (717). One end of the arc-shaped rack (717) is fixedly connected to a limiting plate (718), and the other side of the arc-shaped rack (717) is slidably connected to a fixing plate (719). The lower end of the fixing plate (719) is fixedly connected to a fixing frame (712). The inner side of the fixing plate (719) is fixedly connected to two sets of symmetrical first sliders (7110). The first sliders (7110) are slidably connected to the inner side of the arc-shaped rack (717).

6. The metal guardrail arc welding device according to claim 5, characterized in that: The outer side of the arc-shaped rack (717) is slidably connected to a movable frame (7111), and the inner side of the movable frame (7111) is provided with a second spur gear (7112). A second electric telescopic rod (7113) is installed on one side of the movable frame (7111), and the output shaft of the second electric telescopic rod (7113) is rotatably connected to the second spur gear (7112).

7. The metal guardrail arc welding device according to claim 6, characterized in that: A first bracket (7114) is fixedly connected to the other side of the movable frame (7111). A third motor (7115) is installed on one side of the first bracket (7114). The output shaft of the third motor (7115) is fixedly connected to an elastic clip shaft (7116). The other end of the elastic clip shaft (7116) is fixedly connected to a second spur gear (7112). Two sets of symmetrical second sliders (7117) are fixedly connected to the inner side of the movable frame (7111). The second sliders (7117) are slidably connected to the inner side of the arc-shaped rack (717).

8. The metal guardrail arc welding device according to claim 3, characterized in that: The welding assembly (72) includes a second bracket (721) fixedly connected to a movable frame (7111). A fourth motor (722) is fixedly connected to the upper end of the second bracket (721). A fixed rotating shaft (723) is fixedly connected to the output shaft of the fourth motor (722). A rotating rod (724) is fixedly connected to the lower end of the fixed rotating shaft (723). One end of the rotating rod (724) is rotatably connected to a three-way sleeve (725) via a sleeve. The inner side of the three-way sleeve (725) is slidably connected to... There is a movable pivot (726), and both ends of the movable pivot (726) are fixedly connected to connecting rods (727). The lower ends of the two connecting rods (727) are fixedly connected to an offset pivot (728). A welding machine is provided on the outside of the offset pivot (728). Both ends of the offset pivot (728) are rotatably connected to a connecting frame (729). The upper end of the connecting frame (729) is fixedly connected to the movable frame (7111), and the inner side of the connecting frame (729) is rotatably connected to the fixed pivot (723).

9. The metal guardrail arc welding device according to claim 8, characterized in that: A third spur gear (7210) is fixedly connected to the outer side of the fixed rotating shaft (723). A chain (7211) is meshed with the outer side of the third spur gear (7210). A fourth spur gear (7212) is meshed with the inner side of the chain (7211). A liquid storage tank (7215) is rotatably connected to the upper end of the fourth spur gear (7212). The outer side of the liquid storage tank (7215) is fixedly connected to the movable frame (7111). A sealing ring is provided at the lower end of the liquid storage tank (7215). A drain pipe (7213) is slidably connected to the inner side of the tank (7215). The drain pipe (7213) has a U-shaped cut. The outer side of the drain pipe (7213) is slidably connected to the fourth spur gear (7212). The upper end of the drain pipe (7213) is fixedly connected to the inside of the storage tank (7215) with a feed pipe (7214). The upper end of the feed pipe (7214) is fixedly connected to a stirring rod (7216). The lower end of the drain pipe (7213) is equipped with a solenoid valve spray head (7217).

10. The metal guardrail arc welding device according to claim 9, characterized in that: A third electric telescopic rod (7220) is provided on the outside of the liquid storage tank (7215). The output shaft of the third electric telescopic rod (7220) is fixedly connected to a connecting plate (7219). The other end of the connecting plate (7219) is fixedly connected to a flexible grinding cylinder (7218). The inner side of the flexible grinding cylinder (7218) is fixedly connected to a solenoid valve spray head (7217).

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